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Finding the Fourth Proportional to 660,712.20, 991,068.30 and 394,991.70

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Solution

The fourth proportional to 660,712.20, 991,068.30 and 394,991.70 is: 592,487.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,712.20 : 991,068.30 = 394,991.70 : x
  2. Step 2: Convert to fraction form
    660,712.20/991,068.30 = 394,991.70/x
  3. Step 3: Cross multiply
    660,712.20x = 991,068.30 × 394,991.70
  4. Step 4: Simplify right side
    660,712.20x = 391,463,752,633.11
  5. Step 5: Solve for x
    x = 391,463,752,633.11/660,712.20
  6. Step 6: Final answer
    x = 592,487.55

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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.