Home / 12,821.91-19,236.78-7,761.84

Finding the Fourth Proportional to 12,821.91, 19,236.78 and 7,761.84

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Solution

The fourth proportional to 12,821.91, 19,236.78 and 7,761.84 is: 11,645.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,821.91 : 19,236.78 = 7,761.84 : x
  2. Step 2: Convert to fraction form
    12,821.91/19,236.78 = 7,761.84/x
  3. Step 3: Cross multiply
    12,821.91x = 19,236.78 × 7,761.84
  4. Step 4: Simplify right side
    12,821.91x = 149,312,808.48
  5. Step 5: Solve for x
    x = 149,312,808.48/12,821.91
  6. Step 6: Final answer
    x = 11,645.13

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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.