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Finding the Fourth Proportional to 1,309.41, 1,806.84 and 785.34

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Solution

The fourth proportional to 1,309.41, 1,806.84 and 785.34 is: 1,083.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.41 : 1,806.84 = 785.34 : x
  2. Step 2: Convert to fraction form
    1,309.41/1,806.84 = 785.34/x
  3. Step 3: Cross multiply
    1,309.41x = 1,806.84 × 785.34
  4. Step 4: Simplify right side
    1,309.41x = 1,418,983.73
  5. Step 5: Solve for x
    x = 1,418,983.73/1,309.41
  6. Step 6: Final answer
    x = 1,083.68

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1.5x scale

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.