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Finding the Fourth Proportional to 680.15, 1,020.21 and 314.94

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Solution

The fourth proportional to 680.15, 1,020.21 and 314.94 is: 472.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.15 : 1,020.21 = 314.94 : x
  2. Step 2: Convert to fraction form
    680.15/1,020.21 = 314.94/x
  3. Step 3: Cross multiply
    680.15x = 1,020.21 × 314.94
  4. Step 4: Simplify right side
    680.15x = 321,304.94
  5. Step 5: Solve for x
    x = 321,304.94/680.15
  6. Step 6: Final answer
    x = 472.41

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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.