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Finding the Fourth Proportional to 128,752.20, 193,128.30 and 65,766.60

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Solution

The fourth proportional to 128,752.20, 193,128.30 and 65,766.60 is: 98,649.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,752.20 : 193,128.30 = 65,766.60 : x
  2. Step 2: Convert to fraction form
    128,752.20/193,128.30 = 65,766.60/x
  3. Step 3: Cross multiply
    128,752.20x = 193,128.30 × 65,766.60
  4. Step 4: Simplify right side
    128,752.20x = 12,701,391,654.78
  5. Step 5: Solve for x
    x = 12,701,391,654.78/128,752.20
  6. Step 6: Final answer
    x = 98,649.90

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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.