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Finding the Fourth Proportional to 680.52, 1,020.62 and 315.48

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Solution

The fourth proportional to 680.52, 1,020.62 and 315.48 is: 473.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.52 : 1,020.62 = 315.48 : x
  2. Step 2: Convert to fraction form
    680.52/1,020.62 = 315.48/x
  3. Step 3: Cross multiply
    680.52x = 1,020.62 × 315.48
  4. Step 4: Simplify right side
    680.52x = 321,985.20
  5. Step 5: Solve for x
    x = 321,985.20/680.52
  6. Step 6: Final answer
    x = 473.15

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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.