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Finding the Fourth Proportional to 26,890.40, 40,335.60 and 8,422.40

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Solution

The fourth proportional to 26,890.40, 40,335.60 and 8,422.40 is: 12,633.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,890.40 : 40,335.60 = 8,422.40 : x
  2. Step 2: Convert to fraction form
    26,890.40/40,335.60 = 8,422.40/x
  3. Step 3: Cross multiply
    26,890.40x = 40,335.60 × 8,422.40
  4. Step 4: Simplify right side
    26,890.40x = 339,722,557.44
  5. Step 5: Solve for x
    x = 339,722,557.44/26,890.40
  6. Step 6: Final answer
    x = 12,633.60

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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.