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Finding the Fourth Proportional to 458.78, 688.46 and 170.21

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Solution

The fourth proportional to 458.78, 688.46 and 170.21 is: 255.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.78 : 688.46 = 170.21 : x
  2. Step 2: Convert to fraction form
    458.78/688.46 = 170.21/x
  3. Step 3: Cross multiply
    458.78x = 688.46 × 170.21
  4. Step 4: Simplify right side
    458.78x = 117,183.65
  5. Step 5: Solve for x
    x = 117,183.65/458.78
  6. Step 6: Final answer
    x = 255.43

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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.