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Finding the Fourth Proportional to 63.20, 87.21 and 35.56

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Solution

The fourth proportional to 63.20, 87.21 and 35.56 is: 49.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.20 : 87.21 = 35.56 : x
  2. Step 2: Convert to fraction form
    63.20/87.21 = 35.56/x
  3. Step 3: Cross multiply
    63.20x = 87.21 × 35.56
  4. Step 4: Simplify right side
    63.20x = 3,101.19
  5. Step 5: Solve for x
    x = 3,101.19/63.20
  6. Step 6: Final answer
    x = 49.07

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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.