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Finding the Fourth Proportional to 661,039.28, 991,524.12 and 387,637.52

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Solution

The fourth proportional to 661,039.28, 991,524.12 and 387,637.52 is: 581,435.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,039.28 : 991,524.12 = 387,637.52 : x
  2. Step 2: Convert to fraction form
    661,039.28/991,524.12 = 387,637.52/x
  3. Step 3: Cross multiply
    661,039.28x = 991,524.12 × 387,637.52
  4. Step 4: Simplify right side
    661,039.28x = 384,351,950,896.98
  5. Step 5: Solve for x
    x = 384,351,950,896.98/661,039.28
  6. Step 6: Final answer
    x = 581,435.87

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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.