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Finding the Fourth Proportional to 6,689.70, 9,230.81 and 3,856.86

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Solution

The fourth proportional to 6,689.70, 9,230.81 and 3,856.86 is: 5,321.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,689.70 : 9,230.81 = 3,856.86 : x
  2. Step 2: Convert to fraction form
    6,689.70/9,230.81 = 3,856.86/x
  3. Step 3: Cross multiply
    6,689.70x = 9,230.81 × 3,856.86
  4. Step 4: Simplify right side
    6,689.70x = 35,601,941.86
  5. Step 5: Solve for x
    x = 35,601,941.86/6,689.70
  6. Step 6: Final answer
    x = 5,321.90

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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.