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Finding the Fourth Proportional to 148.10, 222 and 66.90

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Solution

The fourth proportional to 148.10, 222 and 66.90 is: 100.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.10 : 222 = 66.90 : x
  2. Step 2: Convert to fraction form
    148.10/222 = 66.90/x
  3. Step 3: Cross multiply
    148.10x = 222 × 66.90
  4. Step 4: Simplify right side
    148.10x = 14,851.80
  5. Step 5: Solve for x
    x = 14,851.80/148.10
  6. Step 6: Final answer
    x = 100.28

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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.