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Finding the Fourth Proportional to 9,922.92, 13,689.18 and 5,728.20

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Solution

The fourth proportional to 9,922.92, 13,689.18 and 5,728.20 is: 7,902.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,922.92 : 13,689.18 = 5,728.20 : x
  2. Step 2: Convert to fraction form
    9,922.92/13,689.18 = 5,728.20/x
  3. Step 3: Cross multiply
    9,922.92x = 13,689.18 × 5,728.20
  4. Step 4: Simplify right side
    9,922.92x = 78,414,360.88
  5. Step 5: Solve for x
    x = 78,414,360.88/9,922.92
  6. Step 6: Final answer
    x = 7,902.35

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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.