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Finding the Fourth Proportional to 142.16, 212.14 and 126.78

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Solution

The fourth proportional to 142.16, 212.14 and 126.78 is: 189.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.16 : 212.14 = 126.78 : x
  2. Step 2: Convert to fraction form
    142.16/212.14 = 126.78/x
  3. Step 3: Cross multiply
    142.16x = 212.14 × 126.78
  4. Step 4: Simplify right side
    142.16x = 26,894.05
  5. Step 5: Solve for x
    x = 26,894.05/142.16
  6. Step 6: Final answer
    x = 189.19

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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.