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Finding the Fourth Proportional to 63.16, 86.60 and 61.36

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Solution

The fourth proportional to 63.16, 86.60 and 61.36 is: 84.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.16 : 86.60 = 61.36 : x
  2. Step 2: Convert to fraction form
    63.16/86.60 = 61.36/x
  3. Step 3: Cross multiply
    63.16x = 86.60 × 61.36
  4. Step 4: Simplify right side
    63.16x = 5,313.78
  5. Step 5: Solve for x
    x = 5,313.78/63.16
  6. Step 6: Final answer
    x = 84.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.