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Finding the Fourth Proportional to 12,931.28, 17,843.81 and 8,681.48

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Solution

The fourth proportional to 12,931.28, 17,843.81 and 8,681.48 is: 11,979.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,931.28 : 17,843.81 = 8,681.48 : x
  2. Step 2: Convert to fraction form
    12,931.28/17,843.81 = 8,681.48/x
  3. Step 3: Cross multiply
    12,931.28x = 17,843.81 × 8,681.48
  4. Step 4: Simplify right side
    12,931.28x = 154,910,679.64
  5. Step 5: Solve for x
    x = 154,910,679.64/12,931.28
  6. Step 6: Final answer
    x = 11,979.53

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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.