Home / 13,689.09-18,890.87-7,401.33

Finding the Fourth Proportional to 13,689.09, 18,890.87 and 7,401.33

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Solution

The fourth proportional to 13,689.09, 18,890.87 and 7,401.33 is: 10,213.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.09 : 18,890.87 = 7,401.33 : x
  2. Step 2: Convert to fraction form
    13,689.09/18,890.87 = 7,401.33/x
  3. Step 3: Cross multiply
    13,689.09x = 18,890.87 × 7,401.33
  4. Step 4: Simplify right side
    13,689.09x = 139,817,525.85
  5. Step 5: Solve for x
    x = 139,817,525.85/13,689.09
  6. Step 6: Final answer
    x = 10,213.79

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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.