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Finding the Fourth Proportional to 680.15, 1,019.53 and 269.12

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Solution

The fourth proportional to 680.15, 1,019.53 and 269.12 is: 403.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.15 : 1,019.53 = 269.12 : x
  2. Step 2: Convert to fraction form
    680.15/1,019.53 = 269.12/x
  3. Step 3: Cross multiply
    680.15x = 1,019.53 × 269.12
  4. Step 4: Simplify right side
    680.15x = 274,377.79
  5. Step 5: Solve for x
    x = 274,377.79/680.15
  6. Step 6: Final answer
    x = 403.41

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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.