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Finding the Fourth Proportional to 97.76, 134.58 and 87.74

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Solution

The fourth proportional to 97.76, 134.58 and 87.74 is: 120.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.76 : 134.58 = 87.74 : x
  2. Step 2: Convert to fraction form
    97.76/134.58 = 87.74/x
  3. Step 3: Cross multiply
    97.76x = 134.58 × 87.74
  4. Step 4: Simplify right side
    97.76x = 11,808.05
  5. Step 5: Solve for x
    x = 11,808.05/97.76
  6. Step 6: Final answer
    x = 120.79

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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.