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Finding the Fourth Proportional to 816.96, 1,224.26 and 426.12

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Solution

The fourth proportional to 816.96, 1,224.26 and 426.12 is: 638.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.96 : 1,224.26 = 426.12 : x
  2. Step 2: Convert to fraction form
    816.96/1,224.26 = 426.12/x
  3. Step 3: Cross multiply
    816.96x = 1,224.26 × 426.12
  4. Step 4: Simplify right side
    816.96x = 521,681.67
  5. Step 5: Solve for x
    x = 521,681.67/816.96
  6. Step 6: Final answer
    x = 638.56

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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.