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Finding the Fourth Proportional to 148.02, 221.85 and 66.78

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Solution

The fourth proportional to 148.02, 221.85 and 66.78 is: 100.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.02 : 221.85 = 66.78 : x
  2. Step 2: Convert to fraction form
    148.02/221.85 = 66.78/x
  3. Step 3: Cross multiply
    148.02x = 221.85 × 66.78
  4. Step 4: Simplify right side
    148.02x = 14,815.14
  5. Step 5: Solve for x
    x = 14,815.14/148.02
  6. Step 6: Final answer
    x = 100.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.