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Finding the Fourth Proportional to 1,911.80, 2,867.72 and 815.48

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Solution

The fourth proportional to 1,911.80, 2,867.72 and 815.48 is: 1,223.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.80 : 2,867.72 = 815.48 : x
  2. Step 2: Convert to fraction form
    1,911.80/2,867.72 = 815.48/x
  3. Step 3: Cross multiply
    1,911.80x = 2,867.72 × 815.48
  4. Step 4: Simplify right side
    1,911.80x = 2,338,568.31
  5. Step 5: Solve for x
    x = 2,338,568.31/1,911.80
  6. Step 6: Final answer
    x = 1,223.23

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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.