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Finding the Fourth Proportional to 113.40, 169.80 and 74.77

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Solution

The fourth proportional to 113.40, 169.80 and 74.77 is: 111.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.40 : 169.80 = 74.77 : x
  2. Step 2: Convert to fraction form
    113.40/169.80 = 74.77/x
  3. Step 3: Cross multiply
    113.40x = 169.80 × 74.77
  4. Step 4: Simplify right side
    113.40x = 12,695.95
  5. Step 5: Solve for x
    x = 12,695.95/113.40
  6. Step 6: Final answer
    x = 111.96

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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.