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Finding the Fourth Proportional to 67.18, 92.60 and 56.92

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Solution

The fourth proportional to 67.18, 92.60 and 56.92 is: 78.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.18 : 92.60 = 56.92 : x
  2. Step 2: Convert to fraction form
    67.18/92.60 = 56.92/x
  3. Step 3: Cross multiply
    67.18x = 92.60 × 56.92
  4. Step 4: Simplify right side
    67.18x = 5,270.79
  5. Step 5: Solve for x
    x = 5,270.79/67.18
  6. Step 6: Final answer
    x = 78.46

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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.