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Finding the Fourth Proportional to 391,646.60, 587,469.90 and 125,415.80

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Solution

The fourth proportional to 391,646.60, 587,469.90 and 125,415.80 is: 188,123.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,646.60 : 587,469.90 = 125,415.80 : x
  2. Step 2: Convert to fraction form
    391,646.60/587,469.90 = 125,415.80/x
  3. Step 3: Cross multiply
    391,646.60x = 587,469.90 × 125,415.80
  4. Step 4: Simplify right side
    391,646.60x = 73,678,007,484.42
  5. Step 5: Solve for x
    x = 73,678,007,484.42/391,646.60
  6. Step 6: Final answer
    x = 188,123.70

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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.