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Finding the Fourth Proportional to 1,815.07, 2,721.48 and 839.92

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Solution

The fourth proportional to 1,815.07, 2,721.48 and 839.92 is: 1,259.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.07 : 2,721.48 = 839.92 : x
  2. Step 2: Convert to fraction form
    1,815.07/2,721.48 = 839.92/x
  3. Step 3: Cross multiply
    1,815.07x = 2,721.48 × 839.92
  4. Step 4: Simplify right side
    1,815.07x = 2,285,825.48
  5. Step 5: Solve for x
    x = 2,285,825.48/1,815.07
  6. Step 6: Final answer
    x = 1,259.36

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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.