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Finding the Fourth Proportional to 67.10, 92.40 and 61.86

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Solution

The fourth proportional to 67.10, 92.40 and 61.86 is: 85.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.10 : 92.40 = 61.86 : x
  2. Step 2: Convert to fraction form
    67.10/92.40 = 61.86/x
  3. Step 3: Cross multiply
    67.10x = 92.40 × 61.86
  4. Step 4: Simplify right side
    67.10x = 5,715.86
  5. Step 5: Solve for x
    x = 5,715.86/67.10
  6. Step 6: Final answer
    x = 85.18

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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.