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Finding the Fourth Proportional to 28,592.28, 42,889.20 and 7,815.78

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Solution

The fourth proportional to 28,592.28, 42,889.20 and 7,815.78 is: 11,723.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,592.28 : 42,889.20 = 7,815.78 : x
  2. Step 2: Convert to fraction form
    28,592.28/42,889.20 = 7,815.78/x
  3. Step 3: Cross multiply
    28,592.28x = 42,889.20 × 7,815.78
  4. Step 4: Simplify right side
    28,592.28x = 335,212,551.58
  5. Step 5: Solve for x
    x = 335,212,551.58/28,592.28
  6. Step 6: Final answer
    x = 11,723.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.