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Finding the Fourth Proportional to 113.20, 169.50 and 64.90

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Solution

The fourth proportional to 113.20, 169.50 and 64.90 is: 97.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.20 : 169.50 = 64.90 : x
  2. Step 2: Convert to fraction form
    113.20/169.50 = 64.90/x
  3. Step 3: Cross multiply
    113.20x = 169.50 × 64.90
  4. Step 4: Simplify right side
    113.20x = 11,000.55
  5. Step 5: Solve for x
    x = 11,000.55/113.20
  6. Step 6: Final answer
    x = 97.18

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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.