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Finding the Fourth Proportional to 1,815.78, 2,721.54 and 775.47

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Solution

The fourth proportional to 1,815.78, 2,721.54 and 775.47 is: 1,162.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.78 : 2,721.54 = 775.47 : x
  2. Step 2: Convert to fraction form
    1,815.78/2,721.54 = 775.47/x
  3. Step 3: Cross multiply
    1,815.78x = 2,721.54 × 775.47
  4. Step 4: Simplify right side
    1,815.78x = 2,110,472.62
  5. Step 5: Solve for x
    x = 2,110,472.62/1,815.78
  6. Step 6: Final answer
    x = 1,162.30

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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.