Home / 13,228.75-18,255.69-7,639.75

Finding the Fourth Proportional to 13,228.75, 18,255.69 and 7,639.75

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Solution

The fourth proportional to 13,228.75, 18,255.69 and 7,639.75 is: 10,542.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,228.75 : 18,255.69 = 7,639.75 : x
  2. Step 2: Convert to fraction form
    13,228.75/18,255.69 = 7,639.75/x
  3. Step 3: Cross multiply
    13,228.75x = 18,255.69 × 7,639.75
  4. Step 4: Simplify right side
    13,228.75x = 139,468,907.68
  5. Step 5: Solve for x
    x = 139,468,907.68/13,228.75
  6. Step 6: Final answer
    x = 10,542.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.