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Finding the Fourth Proportional to 67.13, 92.54 and 56.80

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Solution

The fourth proportional to 67.13, 92.54 and 56.80 is: 78.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.13 : 92.54 = 56.80 : x
  2. Step 2: Convert to fraction form
    67.13/92.54 = 56.80/x
  3. Step 3: Cross multiply
    67.13x = 92.54 × 56.80
  4. Step 4: Simplify right side
    67.13x = 5,256.53
  5. Step 5: Solve for x
    x = 5,256.53/67.13
  6. Step 6: Final answer
    x = 78.31

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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.