Home / 12,138.38-18,208.86-3,818.66

Finding the Fourth Proportional to 12,138.38, 18,208.86 and 3,818.66

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Solution

The fourth proportional to 12,138.38, 18,208.86 and 3,818.66 is: 5,728.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.38 : 18,208.86 = 3,818.66 : x
  2. Step 2: Convert to fraction form
    12,138.38/18,208.86 = 3,818.66/x
  3. Step 3: Cross multiply
    12,138.38x = 18,208.86 × 3,818.66
  4. Step 4: Simplify right side
    12,138.38x = 69,533,445.33
  5. Step 5: Solve for x
    x = 69,533,445.33/12,138.38
  6. Step 6: Final answer
    x = 5,728.40

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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.