Home / 20,781.36-28,677.78-12,283.38

Finding the Fourth Proportional to 20,781.36, 28,677.78 and 12,283.38

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Solution

The fourth proportional to 20,781.36, 28,677.78 and 12,283.38 is: 16,950.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.36 : 28,677.78 = 12,283.38 : x
  2. Step 2: Convert to fraction form
    20,781.36/28,677.78 = 12,283.38/x
  3. Step 3: Cross multiply
    20,781.36x = 28,677.78 × 12,283.38
  4. Step 4: Simplify right side
    20,781.36x = 352,260,069.30
  5. Step 5: Solve for x
    x = 352,260,069.30/20,781.36
  6. Step 6: Final answer
    x = 16,950.77

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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.