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Finding the Fourth Proportional to 141.51, 211.80 and 115.53

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Solution

The fourth proportional to 141.51, 211.80 and 115.53 is: 172.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.51 : 211.80 = 115.53 : x
  2. Step 2: Convert to fraction form
    141.51/211.80 = 115.53/x
  3. Step 3: Cross multiply
    141.51x = 211.80 × 115.53
  4. Step 4: Simplify right side
    141.51x = 24,469.25
  5. Step 5: Solve for x
    x = 24,469.25/141.51
  6. Step 6: Final answer
    x = 172.92

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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.