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Finding the Fourth Proportional to 1,479, 2,040.93 and 815.85

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Solution

The fourth proportional to 1,479, 2,040.93 and 815.85 is: 1,125.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479 : 2,040.93 = 815.85 : x
  2. Step 2: Convert to fraction form
    1,479/2,040.93 = 815.85/x
  3. Step 3: Cross multiply
    1,479x = 2,040.93 × 815.85
  4. Step 4: Simplify right side
    1,479x = 1,665,092.74
  5. Step 5: Solve for x
    x = 1,665,092.74/1,479
  6. Step 6: Final answer
    x = 1,125.82

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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.