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Finding the Fourth Proportional to 628.66, 868.18 and 518.50

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Solution

The fourth proportional to 628.66, 868.18 and 518.50 is: 716.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.66 : 868.18 = 518.50 : x
  2. Step 2: Convert to fraction form
    628.66/868.18 = 518.50/x
  3. Step 3: Cross multiply
    628.66x = 868.18 × 518.50
  4. Step 4: Simplify right side
    628.66x = 450,151.33
  5. Step 5: Solve for x
    x = 450,151.33/628.66
  6. Step 6: Final answer
    x = 716.05

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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.