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Finding the Fourth Proportional to 815.46, 1,223.18 and 670.74

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Solution

The fourth proportional to 815.46, 1,223.18 and 670.74 is: 1,006.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.46 : 1,223.18 = 670.74 : x
  2. Step 2: Convert to fraction form
    815.46/1,223.18 = 670.74/x
  3. Step 3: Cross multiply
    815.46x = 1,223.18 × 670.74
  4. Step 4: Simplify right side
    815.46x = 820,435.75
  5. Step 5: Solve for x
    x = 820,435.75/815.46
  6. Step 6: Final answer
    x = 1,006.10

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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.