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Finding the Fourth Proportional to 98.56, 135.90 and 76.72

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Solution

The fourth proportional to 98.56, 135.90 and 76.72 is: 105.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.56 : 135.90 = 76.72 : x
  2. Step 2: Convert to fraction form
    98.56/135.90 = 76.72/x
  3. Step 3: Cross multiply
    98.56x = 135.90 × 76.72
  4. Step 4: Simplify right side
    98.56x = 10,426.25
  5. Step 5: Solve for x
    x = 10,426.25/98.56
  6. Step 6: Final answer
    x = 105.79

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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.