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Finding the Fourth Proportional to 815.72, 1,222.40 and 353.38

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Solution

The fourth proportional to 815.72, 1,222.40 and 353.38 is: 529.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.72 : 1,222.40 = 353.38 : x
  2. Step 2: Convert to fraction form
    815.72/1,222.40 = 353.38/x
  3. Step 3: Cross multiply
    815.72x = 1,222.40 × 353.38
  4. Step 4: Simplify right side
    815.72x = 431,971.71
  5. Step 5: Solve for x
    x = 431,971.71/815.72
  6. Step 6: Final answer
    x = 529.56

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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.