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Finding the Fourth Proportional to 136,765.28, 188,731.02 and 85,805.42

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Solution

The fourth proportional to 136,765.28, 188,731.02 and 85,805.42 is: 118,408.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,765.28 : 188,731.02 = 85,805.42 : x
  2. Step 2: Convert to fraction form
    136,765.28/188,731.02 = 85,805.42/x
  3. Step 3: Cross multiply
    136,765.28x = 188,731.02 × 85,805.42
  4. Step 4: Simplify right side
    136,765.28x = 16,194,144,438.13
  5. Step 5: Solve for x
    x = 16,194,144,438.13/136,765.28
  6. Step 6: Final answer
    x = 118,408.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.