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Finding the Fourth Proportional to 69.56, 103.87 and 61.88

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Solution

The fourth proportional to 69.56, 103.87 and 61.88 is: 92.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.56 : 103.87 = 61.88 : x
  2. Step 2: Convert to fraction form
    69.56/103.87 = 61.88/x
  3. Step 3: Cross multiply
    69.56x = 103.87 × 61.88
  4. Step 4: Simplify right side
    69.56x = 6,427.48
  5. Step 5: Solve for x
    x = 6,427.48/69.56
  6. Step 6: Final answer
    x = 92.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.