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Finding the Fourth Proportional to 1,309.44, 1,806.97 and 711.91

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Solution

The fourth proportional to 1,309.44, 1,806.97 and 711.91 is: 982.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.44 : 1,806.97 = 711.91 : x
  2. Step 2: Convert to fraction form
    1,309.44/1,806.97 = 711.91/x
  3. Step 3: Cross multiply
    1,309.44x = 1,806.97 × 711.91
  4. Step 4: Simplify right side
    1,309.44x = 1,286,400.01
  5. Step 5: Solve for x
    x = 1,286,400.01/1,309.44
  6. Step 6: Final answer
    x = 982.40

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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.