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Finding the Fourth Proportional to 1,479.92, 2,042.15 and 816.66

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Solution

The fourth proportional to 1,479.92, 2,042.15 and 816.66 is: 1,126.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.92 : 2,042.15 = 816.66 : x
  2. Step 2: Convert to fraction form
    1,479.92/2,042.15 = 816.66/x
  3. Step 3: Cross multiply
    1,479.92x = 2,042.15 × 816.66
  4. Step 4: Simplify right side
    1,479.92x = 1,667,738.14
  5. Step 5: Solve for x
    x = 1,667,738.14/1,479.92
  6. Step 6: Final answer
    x = 1,126.91

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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.