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Finding the Fourth Proportional to 815.22, 1,222.91 and 353.01

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Solution

The fourth proportional to 815.22, 1,222.91 and 353.01 is: 529.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.22 : 1,222.91 = 353.01 : x
  2. Step 2: Convert to fraction form
    815.22/1,222.91 = 353.01/x
  3. Step 3: Cross multiply
    815.22x = 1,222.91 × 353.01
  4. Step 4: Simplify right side
    815.22x = 431,697.69
  5. Step 5: Solve for x
    x = 431,697.69/815.22
  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.