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Finding the Fourth Proportional to 261,991.01, 392,978.19 and 72,462.80

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Solution

The fourth proportional to 261,991.01, 392,978.19 and 72,462.80 is: 108,691.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,991.01 : 392,978.19 = 72,462.80 : x
  2. Step 2: Convert to fraction form
    261,991.01/392,978.19 = 72,462.80/x
  3. Step 3: Cross multiply
    261,991.01x = 392,978.19 × 72,462.80
  4. Step 4: Simplify right side
    261,991.01x = 28,476,299,986.33
  5. Step 5: Solve for x
    x = 28,476,299,986.33/261,991.01
  6. Step 6: Final answer
    x = 108,691.90

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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.