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Finding the Fourth Proportional to 391,689.81, 587,534.72 and 258,538.92

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Solution

The fourth proportional to 391,689.81, 587,534.72 and 258,538.92 is: 387,808.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,689.81 : 587,534.72 = 258,538.92 : x
  2. Step 2: Convert to fraction form
    391,689.81/587,534.72 = 258,538.92/x
  3. Step 3: Cross multiply
    391,689.81x = 587,534.72 × 258,538.92
  4. Step 4: Simplify right side
    391,689.81x = 151,900,595,614.10
  5. Step 5: Solve for x
    x = 151,900,595,614.10/391,689.81
  6. Step 6: Final answer
    x = 387,808.39

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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.