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Finding the Fourth Proportional to 458.78, 688.20 and 170.14

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Solution

The fourth proportional to 458.78, 688.20 and 170.14 is: 255.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.78 : 688.20 = 170.14 : x
  2. Step 2: Convert to fraction form
    458.78/688.20 = 170.14/x
  3. Step 3: Cross multiply
    458.78x = 688.20 × 170.14
  4. Step 4: Simplify right side
    458.78x = 117,090.35
  5. Step 5: Solve for x
    x = 117,090.35/458.78
  6. Step 6: Final answer
    x = 255.22

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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.