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Finding the Fourth Proportional to 391,086.72, 539,726.40 and 221,320.80

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Solution

The fourth proportional to 391,086.72, 539,726.40 and 221,320.80 is: 305,437.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,086.72 : 539,726.40 = 221,320.80 : x
  2. Step 2: Convert to fraction form
    391,086.72/539,726.40 = 221,320.80/x
  3. Step 3: Cross multiply
    391,086.72x = 539,726.40 × 221,320.80
  4. Step 4: Simplify right side
    391,086.72x = 119,452,678,629.12
  5. Step 5: Solve for x
    x = 119,452,678,629.12/391,086.72
  6. Step 6: Final answer
    x = 305,437.83

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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.