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Finding the Fourth Proportional to 431.60, 647.37 and 106.97

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Solution

The fourth proportional to 431.60, 647.37 and 106.97 is: 160.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.60 : 647.37 = 106.97 : x
  2. Step 2: Convert to fraction form
    431.60/647.37 = 106.97/x
  3. Step 3: Cross multiply
    431.60x = 647.37 × 106.97
  4. Step 4: Simplify right side
    431.60x = 69,245.93
  5. Step 5: Solve for x
    x = 69,245.93/431.60
  6. Step 6: Final answer
    x = 160.44

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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.