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Finding the Fourth Proportional to 809.52, 1,214.28 and 424.56

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Solution

The fourth proportional to 809.52, 1,214.28 and 424.56 is: 636.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.52 : 1,214.28 = 424.56 : x
  2. Step 2: Convert to fraction form
    809.52/1,214.28 = 424.56/x
  3. Step 3: Cross multiply
    809.52x = 1,214.28 × 424.56
  4. Step 4: Simplify right side
    809.52x = 515,534.72
  5. Step 5: Solve for x
    x = 515,534.72/809.52
  6. Step 6: Final answer
    x = 636.84

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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.