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Finding the Fourth Proportional to 682.16, 1,020.24 and 421.52

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Solution

The fourth proportional to 682.16, 1,020.24 and 421.52 is: 630.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.16 : 1,020.24 = 421.52 : x
  2. Step 2: Convert to fraction form
    682.16/1,020.24 = 421.52/x
  3. Step 3: Cross multiply
    682.16x = 1,020.24 × 421.52
  4. Step 4: Simplify right side
    682.16x = 430,046.46
  5. Step 5: Solve for x
    x = 430,046.46/682.16
  6. Step 6: Final answer
    x = 630.42

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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.