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Finding the Fourth Proportional to 258,780.80, 388,167.68 and 66,654.14

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Solution

The fourth proportional to 258,780.80, 388,167.68 and 66,654.14 is: 99,980.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,780.80 : 388,167.68 = 66,654.14 : x
  2. Step 2: Convert to fraction form
    258,780.80/388,167.68 = 66,654.14/x
  3. Step 3: Cross multiply
    258,780.80x = 388,167.68 × 66,654.14
  4. Step 4: Simplify right side
    258,780.80x = 25,872,982,886.20
  5. Step 5: Solve for x
    x = 25,872,982,886.20/258,780.80
  6. Step 6: Final answer
    x = 99,980.30

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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.