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Finding the Fourth Proportional to 815.85, 1,223.78 and 268.08

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Solution

The fourth proportional to 815.85, 1,223.78 and 268.08 is: 402.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.85 : 1,223.78 = 268.08 : x
  2. Step 2: Convert to fraction form
    815.85/1,223.78 = 268.08/x
  3. Step 3: Cross multiply
    815.85x = 1,223.78 × 268.08
  4. Step 4: Simplify right side
    815.85x = 328,064.15
  5. Step 5: Solve for x
    x = 328,064.15/815.85
  6. Step 6: Final answer
    x = 402.11

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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.