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Finding the Fourth Proportional to 63.98, 88.45 and 55.78

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Solution

The fourth proportional to 63.98, 88.45 and 55.78 is: 77.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.98 : 88.45 = 55.78 : x
  2. Step 2: Convert to fraction form
    63.98/88.45 = 55.78/x
  3. Step 3: Cross multiply
    63.98x = 88.45 × 55.78
  4. Step 4: Simplify right side
    63.98x = 4,933.30
  5. Step 5: Solve for x
    x = 4,933.30/63.98
  6. Step 6: Final answer
    x = 77.11

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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.