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Finding the Fourth Proportional to 5,121.45, 7,179.75 and 5,121.45

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Solution

The fourth proportional to 5,121.45, 7,179.75 and 5,121.45 is: 7,179.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,121.45 : 7,179.75 = 5,121.45 : x
  2. Step 2: Convert to fraction form
    5,121.45/7,179.75 = 5,121.45/x
  3. Step 3: Cross multiply
    5,121.45x = 7,179.75 × 5,121.45
  4. Step 4: Simplify right side
    5,121.45x = 36,770,730.64
  5. Step 5: Solve for x
    x = 36,770,730.64/5,121.45
  6. Step 6: Final answer
    x = 7,179.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.