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Finding the Fourth Proportional to 61.11, 91.61 and 26.88

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Solution

The fourth proportional to 61.11, 91.61 and 26.88 is: 40.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.11 : 91.61 = 26.88 : x
  2. Step 2: Convert to fraction form
    61.11/91.61 = 26.88/x
  3. Step 3: Cross multiply
    61.11x = 91.61 × 26.88
  4. Step 4: Simplify right side
    61.11x = 2,462.34
  5. Step 5: Solve for x
    x = 2,462.34/61.11
  6. Step 6: Final answer
    x = 40.29

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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.