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Finding the Fourth Proportional to 28,591.56, 42,859.64 and 12,787.64

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Solution

The fourth proportional to 28,591.56, 42,859.64 and 12,787.64 is: 19,169.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,591.56 : 42,859.64 = 12,787.64 : x
  2. Step 2: Convert to fraction form
    28,591.56/42,859.64 = 12,787.64/x
  3. Step 3: Cross multiply
    28,591.56x = 42,859.64 × 12,787.64
  4. Step 4: Simplify right side
    28,591.56x = 548,073,646.85
  5. Step 5: Solve for x
    x = 548,073,646.85/28,591.56
  6. Step 6: Final answer
    x = 19,169.07

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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.