Home / 13,890.30-19,169.10-7,921.92

Finding the Fourth Proportional to 13,890.30, 19,169.10 and 7,921.92

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Solution

The fourth proportional to 13,890.30, 19,169.10 and 7,921.92 is: 10,932.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,890.30 : 19,169.10 = 7,921.92 : x
  2. Step 2: Convert to fraction form
    13,890.30/19,169.10 = 7,921.92/x
  3. Step 3: Cross multiply
    13,890.30x = 19,169.10 × 7,921.92
  4. Step 4: Simplify right side
    13,890.30x = 151,856,076.67
  5. Step 5: Solve for x
    x = 151,856,076.67/13,890.30
  6. Step 6: Final answer
    x = 10,932.53

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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.