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Finding the Fourth Proportional to 391,089.97, 539,711.82 and 255,210.85

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Solution

The fourth proportional to 391,089.97, 539,711.82 and 255,210.85 is: 352,195.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,089.97 : 539,711.82 = 255,210.85 : x
  2. Step 2: Convert to fraction form
    391,089.97/539,711.82 = 255,210.85/x
  3. Step 3: Cross multiply
    391,089.97x = 539,711.82 × 255,210.85
  4. Step 4: Simplify right side
    391,089.97x = 137,740,312,337.25
  5. Step 5: Solve for x
    x = 137,740,312,337.25/391,089.97
  6. Step 6: Final answer
    x = 352,195.97

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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.