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Finding the Fourth Proportional to 861,029.86, 1,188,278 and 479,057.44

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Solution

The fourth proportional to 861,029.86, 1,188,278 and 479,057.44 is: 661,130.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,029.86 : 1,188,278 = 479,057.44 : x
  2. Step 2: Convert to fraction form
    861,029.86/1,188,278 = 479,057.44/x
  3. Step 3: Cross multiply
    861,029.86x = 1,188,278 × 479,057.44
  4. Step 4: Simplify right side
    861,029.86x = 569,253,416,688.32
  5. Step 5: Solve for x
    x = 569,253,416,688.32/861,029.86
  6. Step 6: Final answer
    x = 661,130.87

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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.