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Finding the Fourth Proportional to 391,128.28, 586,687.47 and 124,885.42

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Solution

The fourth proportional to 391,128.28, 586,687.47 and 124,885.42 is: 187,326.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,128.28 : 586,687.47 = 124,885.42 : x
  2. Step 2: Convert to fraction form
    391,128.28/586,687.47 = 124,885.42/x
  3. Step 3: Cross multiply
    391,128.28x = 586,687.47 × 124,885.42
  4. Step 4: Simplify right side
    391,128.28x = 73,268,709,164.65
  5. Step 5: Solve for x
    x = 73,268,709,164.65/391,128.28
  6. Step 6: Final answer
    x = 187,326.55

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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.