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Finding the Fourth Proportional to 75.18, 111.78 and 74.90

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Solution

The fourth proportional to 75.18, 111.78 and 74.90 is: 111.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.18 : 111.78 = 74.90 : x
  2. Step 2: Convert to fraction form
    75.18/111.78 = 74.90/x
  3. Step 3: Cross multiply
    75.18x = 111.78 × 74.90
  4. Step 4: Simplify right side
    75.18x = 8,372.32
  5. Step 5: Solve for x
    x = 8,372.32/75.18
  6. Step 6: Final answer
    x = 111.36

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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.