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Finding the Fourth Proportional to 128,841.40, 193,358.10 and 66,479.80

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Solution

The fourth proportional to 128,841.40, 193,358.10 and 66,479.80 is: 99,769.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,841.40 : 193,358.10 = 66,479.80 : x
  2. Step 2: Convert to fraction form
    128,841.40/193,358.10 = 66,479.80/x
  3. Step 3: Cross multiply
    128,841.40x = 193,358.10 × 66,479.80
  4. Step 4: Simplify right side
    128,841.40x = 12,854,407,816.38
  5. Step 5: Solve for x
    x = 12,854,407,816.38/128,841.40
  6. Step 6: Final answer
    x = 99,769.23

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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.