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Finding the Fourth Proportional to 28,078.68, 42,115.86 and 8,353.56

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Solution

The fourth proportional to 28,078.68, 42,115.86 and 8,353.56 is: 12,529.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,078.68 : 42,115.86 = 8,353.56 : x
  2. Step 2: Convert to fraction form
    28,078.68/42,115.86 = 8,353.56/x
  3. Step 3: Cross multiply
    28,078.68x = 42,115.86 × 8,353.56
  4. Step 4: Simplify right side
    28,078.68x = 351,817,363.46
  5. Step 5: Solve for x
    x = 351,817,363.46/28,078.68
  6. Step 6: Final answer
    x = 12,529.70

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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.