Home / 12,121.78-16,723.70-7,084.20

Finding the Fourth Proportional to 12,121.78, 16,723.70 and 7,084.20

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Solution

The fourth proportional to 12,121.78, 16,723.70 and 7,084.20 is: 9,773.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,121.78 : 16,723.70 = 7,084.20 : x
  2. Step 2: Convert to fraction form
    12,121.78/16,723.70 = 7,084.20/x
  3. Step 3: Cross multiply
    12,121.78x = 16,723.70 × 7,084.20
  4. Step 4: Simplify right side
    12,121.78x = 118,474,035.54
  5. Step 5: Solve for x
    x = 118,474,035.54/12,121.78
  6. Step 6: Final answer
    x = 9,773.65

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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.