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Finding the Fourth Proportional to 61.33, 91.84 and 40.72

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Solution

The fourth proportional to 61.33, 91.84 and 40.72 is: 60.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.33 : 91.84 = 40.72 : x
  2. Step 2: Convert to fraction form
    61.33/91.84 = 40.72/x
  3. Step 3: Cross multiply
    61.33x = 91.84 × 40.72
  4. Step 4: Simplify right side
    61.33x = 3,739.72
  5. Step 5: Solve for x
    x = 3,739.72/61.33
  6. Step 6: Final answer
    x = 60.98

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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.