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Finding the Fourth Proportional to 258,781.30, 388,168.43 and 66,654.64

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Solution

The fourth proportional to 258,781.30, 388,168.43 and 66,654.64 is: 99,981.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,781.30 : 388,168.43 = 66,654.64 : x
  2. Step 2: Convert to fraction form
    258,781.30/388,168.43 = 66,654.64/x
  3. Step 3: Cross multiply
    258,781.30x = 388,168.43 × 66,654.64
  4. Step 4: Simplify right side
    258,781.30x = 25,873,226,961.02
  5. Step 5: Solve for x
    x = 25,873,226,961.02/258,781.30
  6. Step 6: Final answer
    x = 99,981.05

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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.