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Finding the Fourth Proportional to 26.42, 39.64 and 12.89

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Solution

The fourth proportional to 26.42, 39.64 and 12.89 is: 19.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.42 : 39.64 = 12.89 : x
  2. Step 2: Convert to fraction form
    26.42/39.64 = 12.89/x
  3. Step 3: Cross multiply
    26.42x = 39.64 × 12.89
  4. Step 4: Simplify right side
    26.42x = 510.70
  5. Step 5: Solve for x
    x = 510.70/26.42
  6. Step 6: Final answer
    x = 19.33

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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.