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Finding the Fourth Proportional to 628.43, 866.97 and 431.60

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Solution

The fourth proportional to 628.43, 866.97 and 431.60 is: 595.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.43 : 866.97 = 431.60 : x
  2. Step 2: Convert to fraction form
    628.43/866.97 = 431.60/x
  3. Step 3: Cross multiply
    628.43x = 866.97 × 431.60
  4. Step 4: Simplify right side
    628.43x = 374,184.25
  5. Step 5: Solve for x
    x = 374,184.25/628.43
  6. Step 6: Final answer
    x = 595.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.