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Finding the Fourth Proportional to 15,685.38, 21,655.96 and 9,723.38

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Solution

The fourth proportional to 15,685.38, 21,655.96 and 9,723.38 is: 13,424.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,685.38 : 21,655.96 = 9,723.38 : x
  2. Step 2: Convert to fraction form
    15,685.38/21,655.96 = 9,723.38/x
  3. Step 3: Cross multiply
    15,685.38x = 21,655.96 × 9,723.38
  4. Step 4: Simplify right side
    15,685.38x = 210,568,995.76
  5. Step 5: Solve for x
    x = 210,568,995.76/15,685.38
  6. Step 6: Final answer
    x = 13,424.54

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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.