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Finding the Fourth Proportional to 15,756.47, 21,743.93 and 8,682.87

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Solution

The fourth proportional to 15,756.47, 21,743.93 and 8,682.87 is: 11,982.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,756.47 : 21,743.93 = 8,682.87 : x
  2. Step 2: Convert to fraction form
    15,756.47/21,743.93 = 8,682.87/x
  3. Step 3: Cross multiply
    15,756.47x = 21,743.93 × 8,682.87
  4. Step 4: Simplify right side
    15,756.47x = 188,799,739.19
  5. Step 5: Solve for x
    x = 188,799,739.19/15,756.47
  6. Step 6: Final answer
    x = 11,982.37

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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.