Home / 12,139.32-18,208.26-7,144.50

Finding the Fourth Proportional to 12,139.32, 18,208.26 and 7,144.50

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Solution

The fourth proportional to 12,139.32, 18,208.26 and 7,144.50 is: 10,716.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.32 : 18,208.26 = 7,144.50 : x
  2. Step 2: Convert to fraction form
    12,139.32/18,208.26 = 7,144.50/x
  3. Step 3: Cross multiply
    12,139.32x = 18,208.26 × 7,144.50
  4. Step 4: Simplify right side
    12,139.32x = 130,088,913.57
  5. Step 5: Solve for x
    x = 130,088,913.57/12,139.32
  6. Step 6: Final answer
    x = 10,716.33

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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.