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Finding the Fourth Proportional to 75.12, 111.80 and 74.38

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Solution

The fourth proportional to 75.12, 111.80 and 74.38 is: 110.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.12 : 111.80 = 74.38 : x
  2. Step 2: Convert to fraction form
    75.12/111.80 = 74.38/x
  3. Step 3: Cross multiply
    75.12x = 111.80 × 74.38
  4. Step 4: Simplify right side
    75.12x = 8,315.68
  5. Step 5: Solve for x
    x = 8,315.68/75.12
  6. Step 6: Final answer
    x = 110.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.