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Finding the Fourth Proportional to 15,871.60, 21,901.26 and 8,797.87

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Solution

The fourth proportional to 15,871.60, 21,901.26 and 8,797.87 is: 12,140.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,871.60 : 21,901.26 = 8,797.87 : x
  2. Step 2: Convert to fraction form
    15,871.60/21,901.26 = 8,797.87/x
  3. Step 3: Cross multiply
    15,871.60x = 21,901.26 × 8,797.87
  4. Step 4: Simplify right side
    15,871.60x = 192,684,438.32
  5. Step 5: Solve for x
    x = 192,684,438.32/15,871.60
  6. Step 6: Final answer
    x = 12,140.20

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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.