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Finding the Fourth Proportional to 628.80, 868.55 and 483.22

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Solution

The fourth proportional to 628.80, 868.55 and 483.22 is: 667.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.80 : 868.55 = 483.22 : x
  2. Step 2: Convert to fraction form
    628.80/868.55 = 483.22/x
  3. Step 3: Cross multiply
    628.80x = 868.55 × 483.22
  4. Step 4: Simplify right side
    628.80x = 419,700.73
  5. Step 5: Solve for x
    x = 419,700.73/628.80
  6. Step 6: Final answer
    x = 667.46

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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.