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Finding the Fourth Proportional to 97.37, 145.62 and 86.61

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Solution

The fourth proportional to 97.37, 145.62 and 86.61 is: 129.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.37 : 145.62 = 86.61 : x
  2. Step 2: Convert to fraction form
    97.37/145.62 = 86.61/x
  3. Step 3: Cross multiply
    97.37x = 145.62 × 86.61
  4. Step 4: Simplify right side
    97.37x = 12,611.53
  5. Step 5: Solve for x
    x = 12,611.53/97.37
  6. Step 6: Final answer
    x = 129.52

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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.