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Finding the Fourth Proportional to 521,780.40, 781,763.40 and 240,721.20

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Solution

The fourth proportional to 521,780.40, 781,763.40 and 240,721.20 is: 360,663.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,780.40 : 781,763.40 = 240,721.20 : x
  2. Step 2: Convert to fraction form
    521,780.40/781,763.40 = 240,721.20/x
  3. Step 3: Cross multiply
    521,780.40x = 781,763.40 × 240,721.20
  4. Step 4: Simplify right side
    521,780.40x = 188,187,023,764.08
  5. Step 5: Solve for x
    x = 188,187,023,764.08/521,780.40
  6. Step 6: Final answer
    x = 360,663.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.