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Finding the Fourth Proportional to 628.78, 866.55 and 431.95

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Solution

The fourth proportional to 628.78, 866.55 and 431.95 is: 595.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.78 : 866.55 = 431.95 : x
  2. Step 2: Convert to fraction form
    628.78/866.55 = 431.95/x
  3. Step 3: Cross multiply
    628.78x = 866.55 × 431.95
  4. Step 4: Simplify right side
    628.78x = 374,306.27
  5. Step 5: Solve for x
    x = 374,306.27/628.78
  6. Step 6: Final answer
    x = 595.29

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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.