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Finding the Fourth Proportional to 148.08, 222 and 87.20

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Solution

The fourth proportional to 148.08, 222 and 87.20 is: 130.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.08 : 222 = 87.20 : x
  2. Step 2: Convert to fraction form
    148.08/222 = 87.20/x
  3. Step 3: Cross multiply
    148.08x = 222 × 87.20
  4. Step 4: Simplify right side
    148.08x = 19,358.40
  5. Step 5: Solve for x
    x = 19,358.40/148.08
  6. Step 6: Final answer
    x = 130.73

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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.