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Finding the Fourth Proportional to 816.29, 1,221.37 and 486.02

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Solution

The fourth proportional to 816.29, 1,221.37 and 486.02 is: 727.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.29 : 1,221.37 = 486.02 : x
  2. Step 2: Convert to fraction form
    816.29/1,221.37 = 486.02/x
  3. Step 3: Cross multiply
    816.29x = 1,221.37 × 486.02
  4. Step 4: Simplify right side
    816.29x = 593,601.71
  5. Step 5: Solve for x
    x = 593,601.71/816.29
  6. Step 6: Final answer
    x = 727.20

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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.