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Finding the Fourth Proportional to 142.49, 212.13 and 141.81

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Solution

The fourth proportional to 142.49, 212.13 and 141.81 is: 211.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.49 : 212.13 = 141.81 : x
  2. Step 2: Convert to fraction form
    142.49/212.13 = 141.81/x
  3. Step 3: Cross multiply
    142.49x = 212.13 × 141.81
  4. Step 4: Simplify right side
    142.49x = 30,082.16
  5. Step 5: Solve for x
    x = 30,082.16/142.49
  6. Step 6: Final answer
    x = 211.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.