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Finding the Fourth Proportional to 391,149.25, 539,693.41 and 221,383.38

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Solution

The fourth proportional to 391,149.25, 539,693.41 and 221,383.38 is: 305,456.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,149.25 : 539,693.41 = 221,383.38 : x
  2. Step 2: Convert to fraction form
    391,149.25/539,693.41 = 221,383.38/x
  3. Step 3: Cross multiply
    391,149.25x = 539,693.41 × 221,383.38
  4. Step 4: Simplify right side
    391,149.25x = 119,479,151,269.53
  5. Step 5: Solve for x
    x = 119,479,151,269.53/391,149.25
  6. Step 6: Final answer
    x = 305,456.68

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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.