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Finding the Fourth Proportional to 391,112.76, 539,658.54 and 238,109.88

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Solution

The fourth proportional to 391,112.76, 539,658.54 and 238,109.88 is: 328,544.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,112.76 : 539,658.54 = 238,109.88 : x
  2. Step 2: Convert to fraction form
    391,112.76/539,658.54 = 238,109.88/x
  3. Step 3: Cross multiply
    391,112.76x = 539,658.54 × 238,109.88
  4. Step 4: Simplify right side
    391,112.76x = 128,498,030,200.38
  5. Step 5: Solve for x
    x = 128,498,030,200.38/391,112.76
  6. Step 6: Final answer
    x = 328,544.71

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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.