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Finding the Fourth Proportional to 815.11, 1,223.17 and 352.89

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Solution

The fourth proportional to 815.11, 1,223.17 and 352.89 is: 529.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.11 : 1,223.17 = 352.89 : x
  2. Step 2: Convert to fraction form
    815.11/1,223.17 = 352.89/x
  3. Step 3: Cross multiply
    815.11x = 1,223.17 × 352.89
  4. Step 4: Simplify right side
    815.11x = 431,643.58
  5. Step 5: Solve for x
    x = 431,643.58/815.11
  6. Step 6: Final answer
    x = 529.55

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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.