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Finding the Fourth Proportional to 13,561.92, 18,715.52 and 7,899.95

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Solution

The fourth proportional to 13,561.92, 18,715.52 and 7,899.95 is: 10,901.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,561.92 : 18,715.52 = 7,899.95 : x
  2. Step 2: Convert to fraction form
    13,561.92/18,715.52 = 7,899.95/x
  3. Step 3: Cross multiply
    13,561.92x = 18,715.52 × 7,899.95
  4. Step 4: Simplify right side
    13,561.92x = 147,851,672.22
  5. Step 5: Solve for x
    x = 147,851,672.22/13,561.92
  6. Step 6: Final answer
    x = 10,901.97

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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.