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Finding the Fourth Proportional to 431.44, 647.16 and 174.80

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Solution

The fourth proportional to 431.44, 647.16 and 174.80 is: 262.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.44 : 647.16 = 174.80 : x
  2. Step 2: Convert to fraction form
    431.44/647.16 = 174.80/x
  3. Step 3: Cross multiply
    431.44x = 647.16 × 174.80
  4. Step 4: Simplify right side
    431.44x = 113,123.57
  5. Step 5: Solve for x
    x = 113,123.57/431.44
  6. Step 6: Final answer
    x = 262.20

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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.