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Finding the Fourth Proportional to 7,129.80, 10,688.40 and 2,750.40

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Solution

The fourth proportional to 7,129.80, 10,688.40 and 2,750.40 is: 4,123.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.80 : 10,688.40 = 2,750.40 : x
  2. Step 2: Convert to fraction form
    7,129.80/10,688.40 = 2,750.40/x
  3. Step 3: Cross multiply
    7,129.80x = 10,688.40 × 2,750.40
  4. Step 4: Simplify right side
    7,129.80x = 29,397,375.36
  5. Step 5: Solve for x
    x = 29,397,375.36/7,129.80
  6. Step 6: Final answer
    x = 4,123.17

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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.