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Finding the Fourth Proportional to 8,612.22, 12,921.20 and 3,347.40

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Solution

The fourth proportional to 8,612.22, 12,921.20 and 3,347.40 is: 5,022.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,612.22 : 12,921.20 = 3,347.40 : x
  2. Step 2: Convert to fraction form
    8,612.22/12,921.20 = 3,347.40/x
  3. Step 3: Cross multiply
    8,612.22x = 12,921.20 × 3,347.40
  4. Step 4: Simplify right side
    8,612.22x = 43,252,343.54
  5. Step 5: Solve for x
    x = 43,252,343.54/8,612.22
  6. Step 6: Final answer
    x = 5,022.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.