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Finding the Fourth Proportional to 26.74, 39.78 and 26.65

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Solution

The fourth proportional to 26.74, 39.78 and 26.65 is: 39.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.74 : 39.78 = 26.65 : x
  2. Step 2: Convert to fraction form
    26.74/39.78 = 26.65/x
  3. Step 3: Cross multiply
    26.74x = 39.78 × 26.65
  4. Step 4: Simplify right side
    26.74x = 1,060.14
  5. Step 5: Solve for x
    x = 1,060.14/26.74
  6. Step 6: Final answer
    x = 39.65

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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.