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Finding the Fourth Proportional to 128,865.80, 193,298.70 and 100,872.20

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Solution

The fourth proportional to 128,865.80, 193,298.70 and 100,872.20 is: 151,308.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,865.80 : 193,298.70 = 100,872.20 : x
  2. Step 2: Convert to fraction form
    128,865.80/193,298.70 = 100,872.20/x
  3. Step 3: Cross multiply
    128,865.80x = 193,298.70 × 100,872.20
  4. Step 4: Simplify right side
    128,865.80x = 19,498,465,126.14
  5. Step 5: Solve for x
    x = 19,498,465,126.14/128,865.80
  6. Step 6: Final answer
    x = 151,308.30

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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.