Home / 21,768.11-30,042.42-12,817.85

Finding the Fourth Proportional to 21,768.11, 30,042.42 and 12,817.85

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Solution

The fourth proportional to 21,768.11, 30,042.42 and 12,817.85 is: 17,690.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,768.11 : 30,042.42 = 12,817.85 : x
  2. Step 2: Convert to fraction form
    21,768.11/30,042.42 = 12,817.85/x
  3. Step 3: Cross multiply
    21,768.11x = 30,042.42 × 12,817.85
  4. Step 4: Simplify right side
    21,768.11x = 385,079,233.20
  5. Step 5: Solve for x
    x = 385,079,233.20/21,768.11
  6. Step 6: Final answer
    x = 17,690.06

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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.