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Finding the Fourth Proportional to 639,216.40, 882,121.22 and 352,744.76

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Solution

The fourth proportional to 639,216.40, 882,121.22 and 352,744.76 is: 486,789.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,216.40 : 882,121.22 = 352,744.76 : x
  2. Step 2: Convert to fraction form
    639,216.40/882,121.22 = 352,744.76/x
  3. Step 3: Cross multiply
    639,216.40x = 882,121.22 × 352,744.76
  4. Step 4: Simplify right side
    639,216.40x = 311,163,638,039.81
  5. Step 5: Solve for x
    x = 311,163,638,039.81/639,216.40
  6. Step 6: Final answer
    x = 486,789.20

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.