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Finding the Fourth Proportional to 8,157.20, 11,256.92 and 4,431.20

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Solution

The fourth proportional to 8,157.20, 11,256.92 and 4,431.20 is: 6,115.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,157.20 : 11,256.92 = 4,431.20 : x
  2. Step 2: Convert to fraction form
    8,157.20/11,256.92 = 4,431.20/x
  3. Step 3: Cross multiply
    8,157.20x = 11,256.92 × 4,431.20
  4. Step 4: Simplify right side
    8,157.20x = 49,881,585.46
  5. Step 5: Solve for x
    x = 49,881,585.46/8,157.20
  6. Step 6: Final answer
    x = 6,115.04

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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.