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Finding the Fourth Proportional to 458.80, 687.80 and 170.16

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Solution

The fourth proportional to 458.80, 687.80 and 170.16 is: 255.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.80 : 687.80 = 170.16 : x
  2. Step 2: Convert to fraction form
    458.80/687.80 = 170.16/x
  3. Step 3: Cross multiply
    458.80x = 687.80 × 170.16
  4. Step 4: Simplify right side
    458.80x = 117,036.05
  5. Step 5: Solve for x
    x = 117,036.05/458.80
  6. Step 6: Final answer
    x = 255.09

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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.