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Finding the Fourth Proportional to 63.20, 87.32 and 54.99

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Solution

The fourth proportional to 63.20, 87.32 and 54.99 is: 75.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.20 : 87.32 = 54.99 : x
  2. Step 2: Convert to fraction form
    63.20/87.32 = 54.99/x
  3. Step 3: Cross multiply
    63.20x = 87.32 × 54.99
  4. Step 4: Simplify right side
    63.20x = 4,801.45
  5. Step 5: Solve for x
    x = 4,801.45/63.20
  6. Step 6: Final answer
    x = 75.98

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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.