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Finding the Fourth Proportional to 28,049.60, 38,680.80 and 21,759.68

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Solution

The fourth proportional to 28,049.60, 38,680.80 and 21,759.68 is: 30,006.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,049.60 : 38,680.80 = 21,759.68 : x
  2. Step 2: Convert to fraction form
    28,049.60/38,680.80 = 21,759.68/x
  3. Step 3: Cross multiply
    28,049.60x = 38,680.80 × 21,759.68
  4. Step 4: Simplify right side
    28,049.60x = 841,681,830.14
  5. Step 5: Solve for x
    x = 841,681,830.14/28,049.60
  6. Step 6: Final answer
    x = 30,006.91

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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.