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Finding the Fourth Proportional to 663,039.96, 915,104.88 and 391,174.32

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Solution

The fourth proportional to 663,039.96, 915,104.88 and 391,174.32 is: 539,885.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,039.96 : 915,104.88 = 391,174.32 : x
  2. Step 2: Convert to fraction form
    663,039.96/915,104.88 = 391,174.32/x
  3. Step 3: Cross multiply
    663,039.96x = 915,104.88 × 391,174.32
  4. Step 4: Simplify right side
    663,039.96x = 357,965,529,162.68
  5. Step 5: Solve for x
    x = 357,965,529,162.68/663,039.96
  6. Step 6: Final answer
    x = 539,885.30

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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.