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Finding the Fourth Proportional to 97.26, 145.16 and 87.90

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Solution

The fourth proportional to 97.26, 145.16 and 87.90 is: 131.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.26 : 145.16 = 87.90 : x
  2. Step 2: Convert to fraction form
    97.26/145.16 = 87.90/x
  3. Step 3: Cross multiply
    97.26x = 145.16 × 87.90
  4. Step 4: Simplify right side
    97.26x = 12,759.12
  5. Step 5: Solve for x
    x = 12,759.12/97.26
  6. Step 6: Final answer
    x = 131.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.