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Finding the Fourth Proportional to 8,139.84, 12,201.12 and 6,404.16

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Solution

The fourth proportional to 8,139.84, 12,201.12 and 6,404.16 is: 9,599.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.84 : 12,201.12 = 6,404.16 : x
  2. Step 2: Convert to fraction form
    8,139.84/12,201.12 = 6,404.16/x
  3. Step 3: Cross multiply
    8,139.84x = 12,201.12 × 6,404.16
  4. Step 4: Simplify right side
    8,139.84x = 78,137,924.66
  5. Step 5: Solve for x
    x = 78,137,924.66/8,139.84
  6. Step 6: Final answer
    x = 9,599.44

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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.