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Finding the Fourth Proportional to 142.11, 212.13 and 129.36

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Solution

The fourth proportional to 142.11, 212.13 and 129.36 is: 193.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.11 : 212.13 = 129.36 : x
  2. Step 2: Convert to fraction form
    142.11/212.13 = 129.36/x
  3. Step 3: Cross multiply
    142.11x = 212.13 × 129.36
  4. Step 4: Simplify right side
    142.11x = 27,441.14
  5. Step 5: Solve for x
    x = 27,441.14/142.11
  6. Step 6: Final answer
    x = 193.10

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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.