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Finding the Fourth Proportional to 15,756.81, 21,743.42 and 8,683.35

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Solution

The fourth proportional to 15,756.81, 21,743.42 and 8,683.35 is: 11,982.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,756.81 : 21,743.42 = 8,683.35 : x
  2. Step 2: Convert to fraction form
    15,756.81/21,743.42 = 8,683.35/x
  3. Step 3: Cross multiply
    15,756.81x = 21,743.42 × 8,683.35
  4. Step 4: Simplify right side
    15,756.81x = 188,805,682.64
  5. Step 5: Solve for x
    x = 188,805,682.64/15,756.81
  6. Step 6: Final answer
    x = 11,982.48

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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.