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Finding the Fourth Proportional to 8,664.90, 12,997.35 and 4,290.90

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Solution

The fourth proportional to 8,664.90, 12,997.35 and 4,290.90 is: 6,436.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,664.90 : 12,997.35 = 4,290.90 : x
  2. Step 2: Convert to fraction form
    8,664.90/12,997.35 = 4,290.90/x
  3. Step 3: Cross multiply
    8,664.90x = 12,997.35 × 4,290.90
  4. Step 4: Simplify right side
    8,664.90x = 55,770,329.12
  5. Step 5: Solve for x
    x = 55,770,329.12/8,664.90
  6. Step 6: Final answer
    x = 6,436.35

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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.