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Finding the Fourth Proportional to 1,309.21, 1,806.72 and 711.71

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Solution

The fourth proportional to 1,309.21, 1,806.72 and 711.71 is: 982.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.21 : 1,806.72 = 711.71 : x
  2. Step 2: Convert to fraction form
    1,309.21/1,806.72 = 711.71/x
  3. Step 3: Cross multiply
    1,309.21x = 1,806.72 × 711.71
  4. Step 4: Simplify right side
    1,309.21x = 1,285,858.91
  5. Step 5: Solve for x
    x = 1,285,858.91/1,309.21
  6. Step 6: Final answer
    x = 982.16

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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.