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Finding the Fourth Proportional to 128,808.40, 193,308.60 and 66,446.80

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Solution

The fourth proportional to 128,808.40, 193,308.60 and 66,446.80 is: 99,719.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,808.40 : 193,308.60 = 66,446.80 : x
  2. Step 2: Convert to fraction form
    128,808.40/193,308.60 = 66,446.80/x
  3. Step 3: Cross multiply
    128,808.40x = 193,308.60 × 66,446.80
  4. Step 4: Simplify right side
    128,808.40x = 12,844,737,882.48
  5. Step 5: Solve for x
    x = 12,844,737,882.48/128,808.40
  6. Step 6: Final answer
    x = 99,719.72

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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.