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Finding the Fourth Proportional to 28.15, 42.07 and 26.11

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Solution

The fourth proportional to 28.15, 42.07 and 26.11 is: 39.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.15 : 42.07 = 26.11 : x
  2. Step 2: Convert to fraction form
    28.15/42.07 = 26.11/x
  3. Step 3: Cross multiply
    28.15x = 42.07 × 26.11
  4. Step 4: Simplify right side
    28.15x = 1,098.45
  5. Step 5: Solve for x
    x = 1,098.45/28.15
  6. Step 6: Final answer
    x = 39.02

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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.