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Finding the Fourth Proportional to 97.40, 145.86 and 86.68

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Solution

The fourth proportional to 97.40, 145.86 and 86.68 is: 129.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.40 : 145.86 = 86.68 : x
  2. Step 2: Convert to fraction form
    97.40/145.86 = 86.68/x
  3. Step 3: Cross multiply
    97.40x = 145.86 × 86.68
  4. Step 4: Simplify right side
    97.40x = 12,643.14
  5. Step 5: Solve for x
    x = 12,643.14/97.40
  6. Step 6: Final answer
    x = 129.81

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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.