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Finding the Fourth Proportional to 170.65, 255.74 and 124.78

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Solution

The fourth proportional to 170.65, 255.74 and 124.78 is: 187.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.65 : 255.74 = 124.78 : x
  2. Step 2: Convert to fraction form
    170.65/255.74 = 124.78/x
  3. Step 3: Cross multiply
    170.65x = 255.74 × 124.78
  4. Step 4: Simplify right side
    170.65x = 31,911.24
  5. Step 5: Solve for x
    x = 31,911.24/170.65
  6. Step 6: Final answer
    x = 187.00

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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.