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Finding the Fourth Proportional to 391,089.60, 539,711.31 and 255,210.48

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Solution

The fourth proportional to 391,089.60, 539,711.31 and 255,210.48 is: 352,195.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,089.60 : 539,711.31 = 255,210.48 : x
  2. Step 2: Convert to fraction form
    391,089.60/539,711.31 = 255,210.48/x
  3. Step 3: Cross multiply
    391,089.60x = 539,711.31 × 255,210.48
  4. Step 4: Simplify right side
    391,089.60x = 137,739,978,511.92
  5. Step 5: Solve for x
    x = 137,739,978,511.92/391,089.60
  6. Step 6: Final answer
    x = 352,195.46

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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.