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Finding the Fourth Proportional to 12,491.68, 18,733.20 and 5,553.76

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Solution

The fourth proportional to 12,491.68, 18,733.20 and 5,553.76 is: 8,328.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,491.68 : 18,733.20 = 5,553.76 : x
  2. Step 2: Convert to fraction form
    12,491.68/18,733.20 = 5,553.76/x
  3. Step 3: Cross multiply
    12,491.68x = 18,733.20 × 5,553.76
  4. Step 4: Simplify right side
    12,491.68x = 104,039,696.83
  5. Step 5: Solve for x
    x = 104,039,696.83/12,491.68
  6. Step 6: Final answer
    x = 8,328.72

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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.