Home / 12,138.54-18,212.19-4,242.21

Finding the Fourth Proportional to 12,138.54, 18,212.19 and 4,242.21

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Solution

The fourth proportional to 12,138.54, 18,212.19 and 4,242.21 is: 6,364.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.54 : 18,212.19 = 4,242.21 : x
  2. Step 2: Convert to fraction form
    12,138.54/18,212.19 = 4,242.21/x
  3. Step 3: Cross multiply
    12,138.54x = 18,212.19 × 4,242.21
  4. Step 4: Simplify right side
    12,138.54x = 77,259,934.54
  5. Step 5: Solve for x
    x = 77,259,934.54/12,138.54
  6. Step 6: Final answer
    x = 6,364.85

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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.