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Finding the Fourth Proportional to 715,661.46, 987,592.77 and 393,372.18

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Solution

The fourth proportional to 715,661.46, 987,592.77 and 393,372.18 is: 542,842.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,661.46 : 987,592.77 = 393,372.18 : x
  2. Step 2: Convert to fraction form
    715,661.46/987,592.77 = 393,372.18/x
  3. Step 3: Cross multiply
    715,661.46x = 987,592.77 × 393,372.18
  4. Step 4: Simplify right side
    715,661.46x = 388,491,520,887.14
  5. Step 5: Solve for x
    x = 388,491,520,887.14/715,661.46
  6. Step 6: Final answer
    x = 542,842.59

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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.