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Finding the Fourth Proportional to 391,985.89, 587,923.48 and 125,711.81

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Solution

The fourth proportional to 391,985.89, 587,923.48 and 125,711.81 is: 188,549.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,985.89 : 587,923.48 = 125,711.81 : x
  2. Step 2: Convert to fraction form
    391,985.89/587,923.48 = 125,711.81/x
  3. Step 3: Cross multiply
    391,985.89x = 587,923.48 × 125,711.81
  4. Step 4: Simplify right side
    391,985.89x = 73,908,924,812.30
  5. Step 5: Solve for x
    x = 73,908,924,812.30/391,985.89
  6. Step 6: Final answer
    x = 188,549.96

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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.