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Finding the Fourth Proportional to 680.56, 1,019.88 and 338.80

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Solution

The fourth proportional to 680.56, 1,019.88 and 338.80 is: 507.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.56 : 1,019.88 = 338.80 : x
  2. Step 2: Convert to fraction form
    680.56/1,019.88 = 338.80/x
  3. Step 3: Cross multiply
    680.56x = 1,019.88 × 338.80
  4. Step 4: Simplify right side
    680.56x = 345,535.34
  5. Step 5: Solve for x
    x = 345,535.34/680.56
  6. Step 6: Final answer
    x = 507.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.