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Finding the Fourth Proportional to 815.13, 1,222.70 and 267.17

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Solution

The fourth proportional to 815.13, 1,222.70 and 267.17 is: 400.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.13 : 1,222.70 = 267.17 : x
  2. Step 2: Convert to fraction form
    815.13/1,222.70 = 267.17/x
  3. Step 3: Cross multiply
    815.13x = 1,222.70 × 267.17
  4. Step 4: Simplify right side
    815.13x = 326,661.31
  5. Step 5: Solve for x
    x = 326,661.31/815.13
  6. Step 6: Final answer
    x = 400.75

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Double scale
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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.