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Finding the Fourth Proportional to 391,136.43, 539,675.76 and 221,370.55

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Solution

The fourth proportional to 391,136.43, 539,675.76 and 221,370.55 is: 305,439.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,136.43 : 539,675.76 = 221,370.55 : x
  2. Step 2: Convert to fraction form
    391,136.43/539,675.76 = 221,370.55/x
  3. Step 3: Cross multiply
    391,136.43x = 539,675.76 × 221,370.55
  4. Step 4: Simplify right side
    391,136.43x = 119,468,319,812.87
  5. Step 5: Solve for x
    x = 119,468,319,812.87/391,136.43
  6. Step 6: Final answer
    x = 305,439.00

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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.