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Finding the Fourth Proportional to 61.72, 85.16 and 40.98

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Solution

The fourth proportional to 61.72, 85.16 and 40.98 is: 56.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.72 : 85.16 = 40.98 : x
  2. Step 2: Convert to fraction form
    61.72/85.16 = 40.98/x
  3. Step 3: Cross multiply
    61.72x = 85.16 × 40.98
  4. Step 4: Simplify right side
    61.72x = 3,489.86
  5. Step 5: Solve for x
    x = 3,489.86/61.72
  6. Step 6: Final answer
    x = 56.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.