Home / 12,138.13-18,207.20-3,818.89

Finding the Fourth Proportional to 12,138.13, 18,207.20 and 3,818.89

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Solution

The fourth proportional to 12,138.13, 18,207.20 and 3,818.89 is: 5,728.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.13 : 18,207.20 = 3,818.89 : x
  2. Step 2: Convert to fraction form
    12,138.13/18,207.20 = 3,818.89/x
  3. Step 3: Cross multiply
    12,138.13x = 18,207.20 × 3,818.89
  4. Step 4: Simplify right side
    12,138.13x = 69,531,274.91
  5. Step 5: Solve for x
    x = 69,531,274.91/12,138.13
  6. Step 6: Final answer
    x = 5,728.34

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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.