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Finding the Fourth Proportional to 631.90, 947.75 and 169.70

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Solution

The fourth proportional to 631.90, 947.75 and 169.70 is: 254.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.90 : 947.75 = 169.70 : x
  2. Step 2: Convert to fraction form
    631.90/947.75 = 169.70/x
  3. Step 3: Cross multiply
    631.90x = 947.75 × 169.70
  4. Step 4: Simplify right side
    631.90x = 160,832.33
  5. Step 5: Solve for x
    x = 160,832.33/631.90
  6. Step 6: Final answer
    x = 254.52

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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.