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Finding the Fourth Proportional to 816.35, 1,223.04 and 728.87

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Solution

The fourth proportional to 816.35, 1,223.04 and 728.87 is: 1,091.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.35 : 1,223.04 = 728.87 : x
  2. Step 2: Convert to fraction form
    816.35/1,223.04 = 728.87/x
  3. Step 3: Cross multiply
    816.35x = 1,223.04 × 728.87
  4. Step 4: Simplify right side
    816.35x = 891,437.16
  5. Step 5: Solve for x
    x = 891,437.16/816.35
  6. Step 6: Final answer
    x = 1,091.98

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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.