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Finding the Fourth Proportional to 43.12, 64.65 and 22.78

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Solution

The fourth proportional to 43.12, 64.65 and 22.78 is: 34.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.12 : 64.65 = 22.78 : x
  2. Step 2: Convert to fraction form
    43.12/64.65 = 22.78/x
  3. Step 3: Cross multiply
    43.12x = 64.65 × 22.78
  4. Step 4: Simplify right side
    43.12x = 1,472.73
  5. Step 5: Solve for x
    x = 1,472.73/43.12
  6. Step 6: Final answer
    x = 34.15

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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.