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Finding the Fourth Proportional to 128,748.80, 193,123.20 and 88,659.20

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Solution

The fourth proportional to 128,748.80, 193,123.20 and 88,659.20 is: 132,988.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,748.80 : 193,123.20 = 88,659.20 : x
  2. Step 2: Convert to fraction form
    128,748.80/193,123.20 = 88,659.20/x
  3. Step 3: Cross multiply
    128,748.80x = 193,123.20 × 88,659.20
  4. Step 4: Simplify right side
    128,748.80x = 17,122,148,413.44
  5. Step 5: Solve for x
    x = 17,122,148,413.44/128,748.80
  6. Step 6: Final answer
    x = 132,988.80

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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.