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Finding the Fourth Proportional to 141.32, 212.02 and 72.88

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Solution

The fourth proportional to 141.32, 212.02 and 72.88 is: 109.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.32 : 212.02 = 72.88 : x
  2. Step 2: Convert to fraction form
    141.32/212.02 = 72.88/x
  3. Step 3: Cross multiply
    141.32x = 212.02 × 72.88
  4. Step 4: Simplify right side
    141.32x = 15,452.02
  5. Step 5: Solve for x
    x = 15,452.02/141.32
  6. Step 6: Final answer
    x = 109.34

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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.