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Finding the Fourth Proportional to 61.06, 91.60 and 18.31

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Solution

The fourth proportional to 61.06, 91.60 and 18.31 is: 27.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.06 : 91.60 = 18.31 : x
  2. Step 2: Convert to fraction form
    61.06/91.60 = 18.31/x
  3. Step 3: Cross multiply
    61.06x = 91.60 × 18.31
  4. Step 4: Simplify right side
    61.06x = 1,677.10
  5. Step 5: Solve for x
    x = 1,677.10/61.06
  6. Step 6: Final answer
    x = 27.47

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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.