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Finding the Fourth Proportional to 111.95, 167.95 and 39.80

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Solution

The fourth proportional to 111.95, 167.95 and 39.80 is: 59.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.95 : 167.95 = 39.80 : x
  2. Step 2: Convert to fraction form
    111.95/167.95 = 39.80/x
  3. Step 3: Cross multiply
    111.95x = 167.95 × 39.80
  4. Step 4: Simplify right side
    111.95x = 6,683.93
  5. Step 5: Solve for x
    x = 6,683.93/111.95
  6. Step 6: Final answer
    x = 59.70

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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.