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Finding the Fourth Proportional to 63.61, 87.74 and 39.05

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Solution

The fourth proportional to 63.61, 87.74 and 39.05 is: 53.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.61 : 87.74 = 39.05 : x
  2. Step 2: Convert to fraction form
    63.61/87.74 = 39.05/x
  3. Step 3: Cross multiply
    63.61x = 87.74 × 39.05
  4. Step 4: Simplify right side
    63.61x = 3,426.56
  5. Step 5: Solve for x
    x = 3,426.56/63.61
  6. Step 6: Final answer
    x = 53.87

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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.