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Finding the Fourth Proportional to 97.08, 145.64 and 81.16

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Solution

The fourth proportional to 97.08, 145.64 and 81.16 is: 121.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.08 : 145.64 = 81.16 : x
  2. Step 2: Convert to fraction form
    97.08/145.64 = 81.16/x
  3. Step 3: Cross multiply
    97.08x = 145.64 × 81.16
  4. Step 4: Simplify right side
    97.08x = 11,820.14
  5. Step 5: Solve for x
    x = 11,820.14/97.08
  6. Step 6: Final answer
    x = 121.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.