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Finding the Fourth Proportional to 18,485.94, 25,511.11 and 11,315.71

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Solution

The fourth proportional to 18,485.94, 25,511.11 and 11,315.71 is: 15,615.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,485.94 : 25,511.11 = 11,315.71 : x
  2. Step 2: Convert to fraction form
    18,485.94/25,511.11 = 11,315.71/x
  3. Step 3: Cross multiply
    18,485.94x = 25,511.11 × 11,315.71
  4. Step 4: Simplify right side
    18,485.94x = 288,676,322.54
  5. Step 5: Solve for x
    x = 288,676,322.54/18,485.94
  6. Step 6: Final answer
    x = 15,615.99

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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.