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Finding the Fourth Proportional to 148.84, 221.58 and 142.20

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Solution

The fourth proportional to 148.84, 221.58 and 142.20 is: 211.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.84 : 221.58 = 142.20 : x
  2. Step 2: Convert to fraction form
    148.84/221.58 = 142.20/x
  3. Step 3: Cross multiply
    148.84x = 221.58 × 142.20
  4. Step 4: Simplify right side
    148.84x = 31,508.68
  5. Step 5: Solve for x
    x = 31,508.68/148.84
  6. Step 6: Final answer
    x = 211.69

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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.