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Finding the Fourth Proportional to 1,809.08, 2,712.20 and 769.24

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Solution

The fourth proportional to 1,809.08, 2,712.20 and 769.24 is: 1,153.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,809.08 : 2,712.20 = 769.24 : x
  2. Step 2: Convert to fraction form
    1,809.08/2,712.20 = 769.24/x
  3. Step 3: Cross multiply
    1,809.08x = 2,712.20 × 769.24
  4. Step 4: Simplify right side
    1,809.08x = 2,086,322.10
  5. Step 5: Solve for x
    x = 2,086,322.10/1,809.08
  6. Step 6: Final answer
    x = 1,153.25

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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.