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Finding the Fourth Proportional to 56.20, 83.75 and 54.88

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Solution

The fourth proportional to 56.20, 83.75 and 54.88 is: 81.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.20 : 83.75 = 54.88 : x
  2. Step 2: Convert to fraction form
    56.20/83.75 = 54.88/x
  3. Step 3: Cross multiply
    56.20x = 83.75 × 54.88
  4. Step 4: Simplify right side
    56.20x = 4,596.20
  5. Step 5: Solve for x
    x = 4,596.20/56.20
  6. Step 6: Final answer
    x = 81.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.