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Finding the Fourth Proportional to 74.80, 103 and 63.84

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Solution

The fourth proportional to 74.80, 103 and 63.84 is: 87.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.80 : 103 = 63.84 : x
  2. Step 2: Convert to fraction form
    74.80/103 = 63.84/x
  3. Step 3: Cross multiply
    74.80x = 103 × 63.84
  4. Step 4: Simplify right side
    74.80x = 6,575.52
  5. Step 5: Solve for x
    x = 6,575.52/74.80
  6. Step 6: Final answer
    x = 87.91

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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.