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Finding the Fourth Proportional to 28,116.80, 38,800.80 and 15,540.80

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Solution

The fourth proportional to 28,116.80, 38,800.80 and 15,540.80 is: 21,446.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,116.80 : 38,800.80 = 15,540.80 : x
  2. Step 2: Convert to fraction form
    28,116.80/38,800.80 = 15,540.80/x
  3. Step 3: Cross multiply
    28,116.80x = 38,800.80 × 15,540.80
  4. Step 4: Simplify right side
    28,116.80x = 602,995,472.64
  5. Step 5: Solve for x
    x = 602,995,472.64/28,116.80
  6. Step 6: Final answer
    x = 21,446.09

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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.