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Finding the Fourth Proportional to 97.10, 133.89 and 87.40

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Solution

The fourth proportional to 97.10, 133.89 and 87.40 is: 120.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.10 : 133.89 = 87.40 : x
  2. Step 2: Convert to fraction form
    97.10/133.89 = 87.40/x
  3. Step 3: Cross multiply
    97.10x = 133.89 × 87.40
  4. Step 4: Simplify right side
    97.10x = 11,701.99
  5. Step 5: Solve for x
    x = 11,701.99/97.10
  6. Step 6: Final answer
    x = 120.51

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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.