Home / 12,939.90-19,390.61-6,691.58

Finding the Fourth Proportional to 12,939.90, 19,390.61 and 6,691.58

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Solution

The fourth proportional to 12,939.90, 19,390.61 and 6,691.58 is: 10,027.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.90 : 19,390.61 = 6,691.58 : x
  2. Step 2: Convert to fraction form
    12,939.90/19,390.61 = 6,691.58/x
  3. Step 3: Cross multiply
    12,939.90x = 19,390.61 × 6,691.58
  4. Step 4: Simplify right side
    12,939.90x = 129,753,737.84
  5. Step 5: Solve for x
    x = 129,753,737.84/12,939.90
  6. Step 6: Final answer
    x = 10,027.41

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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.