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Finding the Fourth Proportional to 28.30, 42.67 and 26.45

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Solution

The fourth proportional to 28.30, 42.67 and 26.45 is: 39.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.30 : 42.67 = 26.45 : x
  2. Step 2: Convert to fraction form
    28.30/42.67 = 26.45/x
  3. Step 3: Cross multiply
    28.30x = 42.67 × 26.45
  4. Step 4: Simplify right side
    28.30x = 1,128.62
  5. Step 5: Solve for x
    x = 1,128.62/28.30
  6. Step 6: Final answer
    x = 39.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.