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Finding the Fourth Proportional to 391,118.72, 539,699.21 and 219,012.76

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Solution

The fourth proportional to 391,118.72, 539,699.21 and 219,012.76 is: 302,212.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,118.72 : 539,699.21 = 219,012.76 : x
  2. Step 2: Convert to fraction form
    391,118.72/539,699.21 = 219,012.76/x
  3. Step 3: Cross multiply
    391,118.72x = 539,699.21 × 219,012.76
  4. Step 4: Simplify right side
    391,118.72x = 118,201,009,758.36
  5. Step 5: Solve for x
    x = 118,201,009,758.36/391,118.72
  6. Step 6: Final answer
    x = 302,212.61

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Double scale
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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.