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Finding the Fourth Proportional to 147.96, 220.61 and 142.44

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Solution

The fourth proportional to 147.96, 220.61 and 142.44 is: 212.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.96 : 220.61 = 142.44 : x
  2. Step 2: Convert to fraction form
    147.96/220.61 = 142.44/x
  3. Step 3: Cross multiply
    147.96x = 220.61 × 142.44
  4. Step 4: Simplify right side
    147.96x = 31,423.69
  5. Step 5: Solve for x
    x = 31,423.69/147.96
  6. Step 6: Final answer
    x = 212.38

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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.