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Finding the Fourth Proportional to 170.64, 255.80 and 83.92

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Solution

The fourth proportional to 170.64, 255.80 and 83.92 is: 125.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.64 : 255.80 = 83.92 : x
  2. Step 2: Convert to fraction form
    170.64/255.80 = 83.92/x
  3. Step 3: Cross multiply
    170.64x = 255.80 × 83.92
  4. Step 4: Simplify right side
    170.64x = 21,466.74
  5. Step 5: Solve for x
    x = 21,466.74/170.64
  6. Step 6: Final answer
    x = 125.80

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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.