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Finding the Fourth Proportional to 816.29, 1,223.78 and 328.88

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Solution

The fourth proportional to 816.29, 1,223.78 and 328.88 is: 493.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.29 : 1,223.78 = 328.88 : x
  2. Step 2: Convert to fraction form
    816.29/1,223.78 = 328.88/x
  3. Step 3: Cross multiply
    816.29x = 1,223.78 × 328.88
  4. Step 4: Simplify right side
    816.29x = 402,471.47
  5. Step 5: Solve for x
    x = 402,471.47/816.29
  6. Step 6: Final answer
    x = 493.05

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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.