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Finding the Fourth Proportional to 14,138.60, 21,207.90 and 8,209.40

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Solution

The fourth proportional to 14,138.60, 21,207.90 and 8,209.40 is: 12,314.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,138.60 : 21,207.90 = 8,209.40 : x
  2. Step 2: Convert to fraction form
    14,138.60/21,207.90 = 8,209.40/x
  3. Step 3: Cross multiply
    14,138.60x = 21,207.90 × 8,209.40
  4. Step 4: Simplify right side
    14,138.60x = 174,104,134.26
  5. Step 5: Solve for x
    x = 174,104,134.26/14,138.60
  6. Step 6: Final answer
    x = 12,314.10

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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.