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Finding the Fourth Proportional to 67.80, 93.56 and 56.92

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Solution

The fourth proportional to 67.80, 93.56 and 56.92 is: 78.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.80 : 93.56 = 56.92 : x
  2. Step 2: Convert to fraction form
    67.80/93.56 = 56.92/x
  3. Step 3: Cross multiply
    67.80x = 93.56 × 56.92
  4. Step 4: Simplify right side
    67.80x = 5,325.44
  5. Step 5: Solve for x
    x = 5,325.44/67.80
  6. Step 6: Final answer
    x = 78.55

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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.