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Finding the Fourth Proportional to 97.66, 134.74 and 87.22

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Solution

The fourth proportional to 97.66, 134.74 and 87.22 is: 120.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.66 : 134.74 = 87.22 : x
  2. Step 2: Convert to fraction form
    97.66/134.74 = 87.22/x
  3. Step 3: Cross multiply
    97.66x = 134.74 × 87.22
  4. Step 4: Simplify right side
    97.66x = 11,752.02
  5. Step 5: Solve for x
    x = 11,752.02/97.66
  6. Step 6: Final answer
    x = 120.34

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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.