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Finding the Fourth Proportional to 663,052.87, 915,122.63 and 391,187.21

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Solution

The fourth proportional to 663,052.87, 915,122.63 and 391,187.21 is: 539,903.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,052.87 : 915,122.63 = 391,187.21 : x
  2. Step 2: Convert to fraction form
    663,052.87/915,122.63 = 391,187.21/x
  3. Step 3: Cross multiply
    663,052.87x = 915,122.63 × 391,187.21
  4. Step 4: Simplify right side
    663,052.87x = 357,984,266,481.63
  5. Step 5: Solve for x
    x = 357,984,266,481.63/663,052.87
  6. Step 6: Final answer
    x = 539,903.05

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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.