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Finding the Fourth Proportional to 1,628.76, 2,247.70 and 920.72

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Solution

The fourth proportional to 1,628.76, 2,247.70 and 920.72 is: 1,270.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,628.76 : 2,247.70 = 920.72 : x
  2. Step 2: Convert to fraction form
    1,628.76/2,247.70 = 920.72/x
  3. Step 3: Cross multiply
    1,628.76x = 2,247.70 × 920.72
  4. Step 4: Simplify right side
    1,628.76x = 2,069,494.74
  5. Step 5: Solve for x
    x = 2,069,494.74/1,628.76
  6. Step 6: Final answer
    x = 1,270.60

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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.