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Finding the Fourth Proportional to 815.19, 1,222.79 and 670.61

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Solution

The fourth proportional to 815.19, 1,222.79 and 670.61 is: 1,005.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.19 : 1,222.79 = 670.61 : x
  2. Step 2: Convert to fraction form
    815.19/1,222.79 = 670.61/x
  3. Step 3: Cross multiply
    815.19x = 1,222.79 × 670.61
  4. Step 4: Simplify right side
    815.19x = 820,005.73
  5. Step 5: Solve for x
    x = 820,005.73/815.19
  6. Step 6: Final answer
    x = 1,005.91

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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.