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Finding the Fourth Proportional to 391,729.40, 587,646.39 and 155,016.71

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Solution

The fourth proportional to 391,729.40, 587,646.39 and 155,016.71 is: 232,545.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,729.40 : 587,646.39 = 155,016.71 : x
  2. Step 2: Convert to fraction form
    391,729.40/587,646.39 = 155,016.71/x
  3. Step 3: Cross multiply
    391,729.40x = 587,646.39 × 155,016.71
  4. Step 4: Simplify right side
    391,729.40x = 91,095,010,021.18
  5. Step 5: Solve for x
    x = 91,095,010,021.18/391,729.40
  6. Step 6: Final answer
    x = 232,545.76

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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.