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Finding the Fourth Proportional to 61.02, 91.72 and 40.86

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Solution

The fourth proportional to 61.02, 91.72 and 40.86 is: 61.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.02 : 91.72 = 40.86 : x
  2. Step 2: Convert to fraction form
    61.02/91.72 = 40.86/x
  3. Step 3: Cross multiply
    61.02x = 91.72 × 40.86
  4. Step 4: Simplify right side
    61.02x = 3,747.33
  5. Step 5: Solve for x
    x = 3,747.33/61.02
  6. Step 6: Final answer
    x = 61.41

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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.