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Finding the Fourth Proportional to 391,390.95, 587,123.28 and 125,088.20

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Solution

The fourth proportional to 391,390.95, 587,123.28 and 125,088.20 is: 187,644.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,390.95 : 587,123.28 = 125,088.20 : x
  2. Step 2: Convert to fraction form
    391,390.95/587,123.28 = 125,088.20/x
  3. Step 3: Cross multiply
    391,390.95x = 587,123.28 × 125,088.20
  4. Step 4: Simplify right side
    391,390.95x = 73,442,194,273.30
  5. Step 5: Solve for x
    x = 73,442,194,273.30/391,390.95
  6. Step 6: Final answer
    x = 187,644.08

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1.5x scale

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.