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Finding the Fourth Proportional to 391,690.19, 587,535.29 and 258,539.30

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Solution

The fourth proportional to 391,690.19, 587,535.29 and 258,539.30 is: 387,808.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,690.19 : 587,535.29 = 258,539.30 : x
  2. Step 2: Convert to fraction form
    391,690.19/587,535.29 = 258,539.30/x
  3. Step 3: Cross multiply
    391,690.19x = 587,535.29 × 258,539.30
  4. Step 4: Simplify right side
    391,690.19x = 151,900,958,371.52
  5. Step 5: Solve for x
    x = 151,900,958,371.52/391,690.19
  6. Step 6: Final answer
    x = 387,808.95

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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.