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Finding the Fourth Proportional to 26.55, 39.80 and 12.12

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Solution

The fourth proportional to 26.55, 39.80 and 12.12 is: 18.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.55 : 39.80 = 12.12 : x
  2. Step 2: Convert to fraction form
    26.55/39.80 = 12.12/x
  3. Step 3: Cross multiply
    26.55x = 39.80 × 12.12
  4. Step 4: Simplify right side
    26.55x = 482.38
  5. Step 5: Solve for x
    x = 482.38/26.55
  6. Step 6: Final answer
    x = 18.17

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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.