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Finding the Fourth Proportional to 74.33, 111.45 and 43.90

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Solution

The fourth proportional to 74.33, 111.45 and 43.90 is: 65.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.33 : 111.45 = 43.90 : x
  2. Step 2: Convert to fraction form
    74.33/111.45 = 43.90/x
  3. Step 3: Cross multiply
    74.33x = 111.45 × 43.90
  4. Step 4: Simplify right side
    74.33x = 4,892.66
  5. Step 5: Solve for x
    x = 4,892.66/74.33
  6. Step 6: Final answer
    x = 65.82

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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.