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Finding the Fourth Proportional to 10,115.60, 13,960 and 5,639.38

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Solution

The fourth proportional to 10,115.60, 13,960 and 5,639.38 is: 7,782.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,115.60 : 13,960 = 5,639.38 : x
  2. Step 2: Convert to fraction form
    10,115.60/13,960 = 5,639.38/x
  3. Step 3: Cross multiply
    10,115.60x = 13,960 × 5,639.38
  4. Step 4: Simplify right side
    10,115.60x = 78,725,744.80
  5. Step 5: Solve for x
    x = 78,725,744.80/10,115.60
  6. Step 6: Final answer
    x = 7,782.61

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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.