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Finding the Fourth Proportional to 141.16, 211.29 and 121.72

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Solution

The fourth proportional to 141.16, 211.29 and 121.72 is: 182.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.16 : 211.29 = 121.72 : x
  2. Step 2: Convert to fraction form
    141.16/211.29 = 121.72/x
  3. Step 3: Cross multiply
    141.16x = 211.29 × 121.72
  4. Step 4: Simplify right side
    141.16x = 25,718.22
  5. Step 5: Solve for x
    x = 25,718.22/141.16
  6. Step 6: Final answer
    x = 182.19

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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.