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Finding the Fourth Proportional to 187.92, 282 and 85.32

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Solution

The fourth proportional to 187.92, 282 and 85.32 is: 128.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.92 : 282 = 85.32 : x
  2. Step 2: Convert to fraction form
    187.92/282 = 85.32/x
  3. Step 3: Cross multiply
    187.92x = 282 × 85.32
  4. Step 4: Simplify right side
    187.92x = 24,060.24
  5. Step 5: Solve for x
    x = 24,060.24/187.92
  6. Step 6: Final answer
    x = 128.03

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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.