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Finding the Fourth Proportional to 815.57, 1,223.55 and 353.43

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Solution

The fourth proportional to 815.57, 1,223.55 and 353.43 is: 530.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.57 : 1,223.55 = 353.43 : x
  2. Step 2: Convert to fraction form
    815.57/1,223.55 = 353.43/x
  3. Step 3: Cross multiply
    815.57x = 1,223.55 × 353.43
  4. Step 4: Simplify right side
    815.57x = 432,438.39
  5. Step 5: Solve for x
    x = 432,438.39/815.57
  6. Step 6: Final answer
    x = 530.23

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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.