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Finding the Fourth Proportional to 656.72, 985.10 and 169.78

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Solution

The fourth proportional to 656.72, 985.10 and 169.78 is: 254.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.72 : 985.10 = 169.78 : x
  2. Step 2: Convert to fraction form
    656.72/985.10 = 169.78/x
  3. Step 3: Cross multiply
    656.72x = 985.10 × 169.78
  4. Step 4: Simplify right side
    656.72x = 167,250.28
  5. Step 5: Solve for x
    x = 167,250.28/656.72
  6. Step 6: Final answer
    x = 254.68

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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.