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Finding the Fourth Proportional to 815.49, 1,222.95 and 267.59

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Solution

The fourth proportional to 815.49, 1,222.95 and 267.59 is: 401.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.49 : 1,222.95 = 267.59 : x
  2. Step 2: Convert to fraction form
    815.49/1,222.95 = 267.59/x
  3. Step 3: Cross multiply
    815.49x = 1,222.95 × 267.59
  4. Step 4: Simplify right side
    815.49x = 327,253.25
  5. Step 5: Solve for x
    x = 327,253.25/815.49
  6. Step 6: Final answer
    x = 401.30

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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.