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Finding the Fourth Proportional to 142.16, 211.95 and 138.24

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Solution

The fourth proportional to 142.16, 211.95 and 138.24 is: 206.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.16 : 211.95 = 138.24 : x
  2. Step 2: Convert to fraction form
    142.16/211.95 = 138.24/x
  3. Step 3: Cross multiply
    142.16x = 211.95 × 138.24
  4. Step 4: Simplify right side
    142.16x = 29,299.97
  5. Step 5: Solve for x
    x = 29,299.97/142.16
  6. Step 6: Final answer
    x = 206.11

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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.