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Finding the Fourth Proportional to 1,309.73, 1,806.35 and 811.89

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Solution

The fourth proportional to 1,309.73, 1,806.35 and 811.89 is: 1,119.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.73 : 1,806.35 = 811.89 : x
  2. Step 2: Convert to fraction form
    1,309.73/1,806.35 = 811.89/x
  3. Step 3: Cross multiply
    1,309.73x = 1,806.35 × 811.89
  4. Step 4: Simplify right side
    1,309.73x = 1,466,553.44
  5. Step 5: Solve for x
    x = 1,466,553.44/1,309.73
  6. Step 6: Final answer
    x = 1,119.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.