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Finding the Fourth Proportional to 861,240.72, 1,188,503.64 and 479,260.92

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Solution

The fourth proportional to 861,240.72, 1,188,503.64 and 479,260.92 is: 661,375.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,240.72 : 1,188,503.64 = 479,260.92 : x
  2. Step 2: Convert to fraction form
    861,240.72/1,188,503.64 = 479,260.92/x
  3. Step 3: Cross multiply
    861,240.72x = 1,188,503.64 × 479,260.92
  4. Step 4: Simplify right side
    861,240.72x = 569,603,347,929.75
  5. Step 5: Solve for x
    x = 569,603,347,929.75/861,240.72
  6. Step 6: Final answer
    x = 661,375.31

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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.