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Finding the Fourth Proportional to 28,640.86, 42,958.10 and 8,917.76

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Solution

The fourth proportional to 28,640.86, 42,958.10 and 8,917.76 is: 13,375.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,640.86 : 42,958.10 = 8,917.76 : x
  2. Step 2: Convert to fraction form
    28,640.86/42,958.10 = 8,917.76/x
  3. Step 3: Cross multiply
    28,640.86x = 42,958.10 × 8,917.76
  4. Step 4: Simplify right side
    28,640.86x = 383,090,155.55
  5. Step 5: Solve for x
    x = 383,090,155.55/28,640.86
  6. Step 6: Final answer
    x = 13,375.65

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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.