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Finding the Fourth Proportional to 148.20, 204.69 and 113.40

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Solution

The fourth proportional to 148.20, 204.69 and 113.40 is: 156.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.20 : 204.69 = 113.40 : x
  2. Step 2: Convert to fraction form
    148.20/204.69 = 113.40/x
  3. Step 3: Cross multiply
    148.20x = 204.69 × 113.40
  4. Step 4: Simplify right side
    148.20x = 23,211.85
  5. Step 5: Solve for x
    x = 23,211.85/148.20
  6. Step 6: Final answer
    x = 156.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.