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Finding the Fourth Proportional to 15,900.36, 21,943.23 and 9,186.87

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Solution

The fourth proportional to 15,900.36, 21,943.23 and 9,186.87 is: 12,678.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,900.36 : 21,943.23 = 9,186.87 : x
  2. Step 2: Convert to fraction form
    15,900.36/21,943.23 = 9,186.87/x
  3. Step 3: Cross multiply
    15,900.36x = 21,943.23 × 9,186.87
  4. Step 4: Simplify right side
    15,900.36x = 201,589,601.39
  5. Step 5: Solve for x
    x = 201,589,601.39/15,900.36
  6. Step 6: Final answer
    x = 12,678.30

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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.