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Finding the Fourth Proportional to 391,141.59, 539,682.88 and 221,375.71

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Solution

The fourth proportional to 391,141.59, 539,682.88 and 221,375.71 is: 305,446.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,141.59 : 539,682.88 = 221,375.71 : x
  2. Step 2: Convert to fraction form
    391,141.59/539,682.88 = 221,375.71/x
  3. Step 3: Cross multiply
    391,141.59x = 539,682.88 × 221,375.71
  4. Step 4: Simplify right side
    391,141.59x = 119,472,679,627.97
  5. Step 5: Solve for x
    x = 119,472,679,627.97/391,141.59
  6. Step 6: Final answer
    x = 305,446.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.