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Finding the Fourth Proportional to 128,946.60, 193,419.90 and 115,387.20

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Solution

The fourth proportional to 128,946.60, 193,419.90 and 115,387.20 is: 173,080.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,946.60 : 193,419.90 = 115,387.20 : x
  2. Step 2: Convert to fraction form
    128,946.60/193,419.90 = 115,387.20/x
  3. Step 3: Cross multiply
    128,946.60x = 193,419.90 × 115,387.20
  4. Step 4: Simplify right side
    128,946.60x = 22,318,180,685.28
  5. Step 5: Solve for x
    x = 22,318,180,685.28/128,946.60
  6. Step 6: Final answer
    x = 173,080.80

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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.