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Finding the Fourth Proportional to 128,781.60, 193,402.80 and 124,634.40

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Solution

The fourth proportional to 128,781.60, 193,402.80 and 124,634.40 is: 187,174.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,781.60 : 193,402.80 = 124,634.40 : x
  2. Step 2: Convert to fraction form
    128,781.60/193,402.80 = 124,634.40/x
  3. Step 3: Cross multiply
    128,781.60x = 193,402.80 × 124,634.40
  4. Step 4: Simplify right side
    128,781.60x = 24,104,641,936.32
  5. Step 5: Solve for x
    x = 24,104,641,936.32/128,781.60
  6. Step 6: Final answer
    x = 187,174.58

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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.