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Finding the Fourth Proportional to 628.08, 868.56 and 559.12

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Solution

The fourth proportional to 628.08, 868.56 and 559.12 is: 773.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.08 : 868.56 = 559.12 : x
  2. Step 2: Convert to fraction form
    628.08/868.56 = 559.12/x
  3. Step 3: Cross multiply
    628.08x = 868.56 × 559.12
  4. Step 4: Simplify right side
    628.08x = 485,629.27
  5. Step 5: Solve for x
    x = 485,629.27/628.08
  6. Step 6: Final answer
    x = 773.20

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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.