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Finding the Fourth Proportional to 8,900, 12,278.88 and 5,917.28

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Solution

The fourth proportional to 8,900, 12,278.88 and 5,917.28 is: 8,163.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,900 : 12,278.88 = 5,917.28 : x
  2. Step 2: Convert to fraction form
    8,900/12,278.88 = 5,917.28/x
  3. Step 3: Cross multiply
    8,900x = 12,278.88 × 5,917.28
  4. Step 4: Simplify right side
    8,900x = 72,657,571.05
  5. Step 5: Solve for x
    x = 72,657,571.05/8,900
  6. Step 6: Final answer
    x = 8,163.77

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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.