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Finding the Fourth Proportional to 97.30, 133.55 and 87.28

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Solution

The fourth proportional to 97.30, 133.55 and 87.28 is: 119.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.30 : 133.55 = 87.28 : x
  2. Step 2: Convert to fraction form
    97.30/133.55 = 87.28/x
  3. Step 3: Cross multiply
    97.30x = 133.55 × 87.28
  4. Step 4: Simplify right side
    97.30x = 11,655.80
  5. Step 5: Solve for x
    x = 11,655.80/97.30
  6. Step 6: Final answer
    x = 119.79

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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.