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Finding the Fourth Proportional to 141.50, 212.05 and 72.87

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Solution

The fourth proportional to 141.50, 212.05 and 72.87 is: 109.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.50 : 212.05 = 72.87 : x
  2. Step 2: Convert to fraction form
    141.50/212.05 = 72.87/x
  3. Step 3: Cross multiply
    141.50x = 212.05 × 72.87
  4. Step 4: Simplify right side
    141.50x = 15,452.08
  5. Step 5: Solve for x
    x = 15,452.08/141.50
  6. Step 6: Final answer
    x = 109.20

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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.