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Finding the Fourth Proportional to 816.26, 1,224.40 and 322.70

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Solution

The fourth proportional to 816.26, 1,224.40 and 322.70 is: 484.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.26 : 1,224.40 = 322.70 : x
  2. Step 2: Convert to fraction form
    816.26/1,224.40 = 322.70/x
  3. Step 3: Cross multiply
    816.26x = 1,224.40 × 322.70
  4. Step 4: Simplify right side
    816.26x = 395,113.88
  5. Step 5: Solve for x
    x = 395,113.88/816.26
  6. Step 6: Final answer
    x = 484.05

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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.