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Finding the Fourth Proportional to 7,129.84, 10,696.38 and 2,688.88

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Solution

The fourth proportional to 7,129.84, 10,696.38 and 2,688.88 is: 4,033.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.84 : 10,696.38 = 2,688.88 : x
  2. Step 2: Convert to fraction form
    7,129.84/10,696.38 = 2,688.88/x
  3. Step 3: Cross multiply
    7,129.84x = 10,696.38 × 2,688.88
  4. Step 4: Simplify right side
    7,129.84x = 28,761,282.25
  5. Step 5: Solve for x
    x = 28,761,282.25/7,129.84
  6. Step 6: Final answer
    x = 4,033.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.