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Finding the Fourth Proportional to 61.86, 85.40 and 41.18

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Solution

The fourth proportional to 61.86, 85.40 and 41.18 is: 56.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.86 : 85.40 = 41.18 : x
  2. Step 2: Convert to fraction form
    61.86/85.40 = 41.18/x
  3. Step 3: Cross multiply
    61.86x = 85.40 × 41.18
  4. Step 4: Simplify right side
    61.86x = 3,516.77
  5. Step 5: Solve for x
    x = 3,516.77/61.86
  6. Step 6: Final answer
    x = 56.85

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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.