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Finding the Fourth Proportional to 73.99, 111.38 and 66.55

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Solution

The fourth proportional to 73.99, 111.38 and 66.55 is: 100.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.99 : 111.38 = 66.55 : x
  2. Step 2: Convert to fraction form
    73.99/111.38 = 66.55/x
  3. Step 3: Cross multiply
    73.99x = 111.38 × 66.55
  4. Step 4: Simplify right side
    73.99x = 7,412.18
  5. Step 5: Solve for x
    x = 7,412.18/73.99
  6. Step 6: Final answer
    x = 100.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.