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Finding the Fourth Proportional to 142.56, 214.79 and 141.35

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Solution

The fourth proportional to 142.56, 214.79 and 141.35 is: 212.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.56 : 214.79 = 141.35 : x
  2. Step 2: Convert to fraction form
    142.56/214.79 = 141.35/x
  3. Step 3: Cross multiply
    142.56x = 214.79 × 141.35
  4. Step 4: Simplify right side
    142.56x = 30,358.79
  5. Step 5: Solve for x
    x = 30,358.79/142.56
  6. Step 6: Final answer
    x = 212.95

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.