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Finding the Fourth Proportional to 63.21, 87.17 and 43.58

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Solution

The fourth proportional to 63.21, 87.17 and 43.58 is: 60.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.21 : 87.17 = 43.58 : x
  2. Step 2: Convert to fraction form
    63.21/87.17 = 43.58/x
  3. Step 3: Cross multiply
    63.21x = 87.17 × 43.58
  4. Step 4: Simplify right side
    63.21x = 3,798.21
  5. Step 5: Solve for x
    x = 3,798.21/63.21
  6. Step 6: Final answer
    x = 60.09

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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.