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Finding the Fourth Proportional to 74.87, 103.25 and 63.21

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Solution

The fourth proportional to 74.87, 103.25 and 63.21 is: 87.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.87 : 103.25 = 63.21 : x
  2. Step 2: Convert to fraction form
    74.87/103.25 = 63.21/x
  3. Step 3: Cross multiply
    74.87x = 103.25 × 63.21
  4. Step 4: Simplify right side
    74.87x = 6,526.12
  5. Step 5: Solve for x
    x = 6,526.12/74.87
  6. Step 6: Final answer
    x = 87.17

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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.