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Finding the Fourth Proportional to 259,654.70, 389,443.65 and 72,685.10

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Solution

The fourth proportional to 259,654.70, 389,443.65 and 72,685.10 is: 109,016.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,654.70 : 389,443.65 = 72,685.10 : x
  2. Step 2: Convert to fraction form
    259,654.70/389,443.65 = 72,685.10/x
  3. Step 3: Cross multiply
    259,654.70x = 389,443.65 × 72,685.10
  4. Step 4: Simplify right side
    259,654.70x = 28,306,750,644.62
  5. Step 5: Solve for x
    x = 28,306,750,644.62/259,654.70
  6. Step 6: Final answer
    x = 109,016.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.