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Finding the Fourth Proportional to 15,187.66, 20,959.49 and 8,813.76

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Solution

The fourth proportional to 15,187.66, 20,959.49 and 8,813.76 is: 12,163.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,187.66 : 20,959.49 = 8,813.76 : x
  2. Step 2: Convert to fraction form
    15,187.66/20,959.49 = 8,813.76/x
  3. Step 3: Cross multiply
    15,187.66x = 20,959.49 × 8,813.76
  4. Step 4: Simplify right side
    15,187.66x = 184,731,914.58
  5. Step 5: Solve for x
    x = 184,731,914.58/15,187.66
  6. Step 6: Final answer
    x = 12,163.29

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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.