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Finding the Fourth Proportional to 391,909.96, 587,913.56 and 111,449.08

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Solution

The fourth proportional to 391,909.96, 587,913.56 and 111,449.08 is: 167,187.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,909.96 : 587,913.56 = 111,449.08 : x
  2. Step 2: Convert to fraction form
    391,909.96/587,913.56 = 111,449.08/x
  3. Step 3: Cross multiply
    391,909.96x = 587,913.56 × 111,449.08
  4. Step 4: Simplify right side
    391,909.96x = 65,522,425,381.52
  5. Step 5: Solve for x
    x = 65,522,425,381.52/391,909.96
  6. Step 6: Final answer
    x = 167,187.45

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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.