Home / 7,142.22-9,856.32-3,998.40

Finding the Fourth Proportional to 7,142.22, 9,856.32 and 3,998.40

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Solution

The fourth proportional to 7,142.22, 9,856.32 and 3,998.40 is: 5,517.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,142.22 : 9,856.32 = 3,998.40 : x
  2. Step 2: Convert to fraction form
    7,142.22/9,856.32 = 3,998.40/x
  3. Step 3: Cross multiply
    7,142.22x = 9,856.32 × 3,998.40
  4. Step 4: Simplify right side
    7,142.22x = 39,409,509.89
  5. Step 5: Solve for x
    x = 39,409,509.89/7,142.22
  6. Step 6: Final answer
    x = 5,517.82

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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.