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Finding the Fourth Proportional to 1,909.37, 2,864.13 and 812.99

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Solution

The fourth proportional to 1,909.37, 2,864.13 and 812.99 is: 1,219.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.37 : 2,864.13 = 812.99 : x
  2. Step 2: Convert to fraction form
    1,909.37/2,864.13 = 812.99/x
  3. Step 3: Cross multiply
    1,909.37x = 2,864.13 × 812.99
  4. Step 4: Simplify right side
    1,909.37x = 2,328,494.73
  5. Step 5: Solve for x
    x = 2,328,494.73/1,909.37
  6. Step 6: Final answer
    x = 1,219.51

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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.