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Finding the Fourth Proportional to 63.01, 86.91 and 40.87

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Solution

The fourth proportional to 63.01, 86.91 and 40.87 is: 56.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.01 : 86.91 = 40.87 : x
  2. Step 2: Convert to fraction form
    63.01/86.91 = 40.87/x
  3. Step 3: Cross multiply
    63.01x = 86.91 × 40.87
  4. Step 4: Simplify right side
    63.01x = 3,552.01
  5. Step 5: Solve for x
    x = 3,552.01/63.01
  6. Step 6: Final answer
    x = 56.37

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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.