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Finding the Fourth Proportional to 11,418.80, 15,760 and 6,639.40

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Solution

The fourth proportional to 11,418.80, 15,760 and 6,639.40 is: 9,163.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,418.80 : 15,760 = 6,639.40 : x
  2. Step 2: Convert to fraction form
    11,418.80/15,760 = 6,639.40/x
  3. Step 3: Cross multiply
    11,418.80x = 15,760 × 6,639.40
  4. Step 4: Simplify right side
    11,418.80x = 104,636,944
  5. Step 5: Solve for x
    x = 104,636,944/11,418.80
  6. Step 6: Final answer
    x = 9,163.57

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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.