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Finding the Fourth Proportional to 56.67, 78.61 and 54.78

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Solution

The fourth proportional to 56.67, 78.61 and 54.78 is: 75.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.67 : 78.61 = 54.78 : x
  2. Step 2: Convert to fraction form
    56.67/78.61 = 54.78/x
  3. Step 3: Cross multiply
    56.67x = 78.61 × 54.78
  4. Step 4: Simplify right side
    56.67x = 4,305.98
  5. Step 5: Solve for x
    x = 4,305.98/56.67
  6. Step 6: Final answer
    x = 75.98

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.