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Finding the Fourth Proportional to 1,909.44, 2,864.36 and 813.40

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Solution

The fourth proportional to 1,909.44, 2,864.36 and 813.40 is: 1,220.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.44 : 2,864.36 = 813.40 : x
  2. Step 2: Convert to fraction form
    1,909.44/2,864.36 = 813.40/x
  3. Step 3: Cross multiply
    1,909.44x = 2,864.36 × 813.40
  4. Step 4: Simplify right side
    1,909.44x = 2,329,865.30
  5. Step 5: Solve for x
    x = 2,329,865.30/1,909.44
  6. Step 6: Final answer
    x = 1,220.18

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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.