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Finding the Fourth Proportional to 15,871.52, 21,895.80 and 11,158.88

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Solution

The fourth proportional to 15,871.52, 21,895.80 and 11,158.88 is: 15,394.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,871.52 : 21,895.80 = 11,158.88 : x
  2. Step 2: Convert to fraction form
    15,871.52/21,895.80 = 11,158.88/x
  3. Step 3: Cross multiply
    15,871.52x = 21,895.80 × 11,158.88
  4. Step 4: Simplify right side
    15,871.52x = 244,332,604.70
  5. Step 5: Solve for x
    x = 244,332,604.70/15,871.52
  6. Step 6: Final answer
    x = 15,394.40

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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.