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Finding the Fourth Proportional to 26.64, 39.84 and 15.78

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Solution

The fourth proportional to 26.64, 39.84 and 15.78 is: 23.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.64 : 39.84 = 15.78 : x
  2. Step 2: Convert to fraction form
    26.64/39.84 = 15.78/x
  3. Step 3: Cross multiply
    26.64x = 39.84 × 15.78
  4. Step 4: Simplify right side
    26.64x = 628.53
  5. Step 5: Solve for x
    x = 628.53/26.64
  6. Step 6: Final answer
    x = 23.59

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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.