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Finding the Fourth Proportional to 74.42, 111.64 and 25.66

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Solution

The fourth proportional to 74.42, 111.64 and 25.66 is: 38.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.42 : 111.64 = 25.66 : x
  2. Step 2: Convert to fraction form
    74.42/111.64 = 25.66/x
  3. Step 3: Cross multiply
    74.42x = 111.64 × 25.66
  4. Step 4: Simplify right side
    74.42x = 2,864.94
  5. Step 5: Solve for x
    x = 2,864.94/74.42
  6. Step 6: Final answer
    x = 38.50

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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.