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Finding the Fourth Proportional to 661,185.48, 991,699.38 and 391,474.92

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Solution

The fourth proportional to 661,185.48, 991,699.38 and 391,474.92 is: 587,165.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,185.48 : 991,699.38 = 391,474.92 : x
  2. Step 2: Convert to fraction form
    661,185.48/991,699.38 = 391,474.92/x
  3. Step 3: Cross multiply
    661,185.48x = 991,699.38 × 391,474.92
  4. Step 4: Simplify right side
    661,185.48x = 388,225,435,449.55
  5. Step 5: Solve for x
    x = 388,225,435,449.55/661,185.48
  6. Step 6: Final answer
    x = 587,165.70

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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.