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Finding the Fourth Proportional to 123.92, 185.98 and 85.32

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Solution

The fourth proportional to 123.92, 185.98 and 85.32 is: 128.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.92 : 185.98 = 85.32 : x
  2. Step 2: Convert to fraction form
    123.92/185.98 = 85.32/x
  3. Step 3: Cross multiply
    123.92x = 185.98 × 85.32
  4. Step 4: Simplify right side
    123.92x = 15,867.81
  5. Step 5: Solve for x
    x = 15,867.81/123.92
  6. Step 6: Final answer
    x = 128.05

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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.