Home / 13,638.12-20,436.20-8,080.40

Finding the Fourth Proportional to 13,638.12, 20,436.20 and 8,080.40

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Solution

The fourth proportional to 13,638.12, 20,436.20 and 8,080.40 is: 12,108.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.12 : 20,436.20 = 8,080.40 : x
  2. Step 2: Convert to fraction form
    13,638.12/20,436.20 = 8,080.40/x
  3. Step 3: Cross multiply
    13,638.12x = 20,436.20 × 8,080.40
  4. Step 4: Simplify right side
    13,638.12x = 165,132,670.48
  5. Step 5: Solve for x
    x = 165,132,670.48/13,638.12
  6. Step 6: Final answer
    x = 12,108.17

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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.