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Finding the Fourth Proportional to 1,208.66, 1,669.31 and 815

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Solution

The fourth proportional to 1,208.66, 1,669.31 and 815 is: 1,125.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.66 : 1,669.31 = 815 : x
  2. Step 2: Convert to fraction form
    1,208.66/1,669.31 = 815/x
  3. Step 3: Cross multiply
    1,208.66x = 1,669.31 × 815
  4. Step 4: Simplify right side
    1,208.66x = 1,360,487.65
  5. Step 5: Solve for x
    x = 1,360,487.65/1,208.66
  6. Step 6: Final answer
    x = 1,125.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.