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Finding the Fourth Proportional to 15,871.32, 21,903.66 and 8,799.12

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Solution

The fourth proportional to 15,871.32, 21,903.66 and 8,799.12 is: 12,143.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,871.32 : 21,903.66 = 8,799.12 : x
  2. Step 2: Convert to fraction form
    15,871.32/21,903.66 = 8,799.12/x
  3. Step 3: Cross multiply
    15,871.32x = 21,903.66 × 8,799.12
  4. Step 4: Simplify right side
    15,871.32x = 192,732,932.78
  5. Step 5: Solve for x
    x = 192,732,932.78/15,871.32
  6. Step 6: Final answer
    x = 12,143.47

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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.