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Finding the Fourth Proportional to 63.78, 95.80 and 53.65

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Solution

The fourth proportional to 63.78, 95.80 and 53.65 is: 80.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.78 : 95.80 = 53.65 : x
  2. Step 2: Convert to fraction form
    63.78/95.80 = 53.65/x
  3. Step 3: Cross multiply
    63.78x = 95.80 × 53.65
  4. Step 4: Simplify right side
    63.78x = 5,139.67
  5. Step 5: Solve for x
    x = 5,139.67/63.78
  6. Step 6: Final answer
    x = 80.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.