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Finding the Fourth Proportional to 113.68, 170.45 and 45.18

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Solution

The fourth proportional to 113.68, 170.45 and 45.18 is: 67.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.68 : 170.45 = 45.18 : x
  2. Step 2: Convert to fraction form
    113.68/170.45 = 45.18/x
  3. Step 3: Cross multiply
    113.68x = 170.45 × 45.18
  4. Step 4: Simplify right side
    113.68x = 7,701.04
  5. Step 5: Solve for x
    x = 7,701.04/113.68
  6. Step 6: Final answer
    x = 67.74

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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.