Home / 20,856.49-28,781.67-11,425.12

Finding the Fourth Proportional to 20,856.49, 28,781.67 and 11,425.12

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Solution

The fourth proportional to 20,856.49, 28,781.67 and 11,425.12 is: 15,766.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.49 : 28,781.67 = 11,425.12 : x
  2. Step 2: Convert to fraction form
    20,856.49/28,781.67 = 11,425.12/x
  3. Step 3: Cross multiply
    20,856.49x = 28,781.67 × 11,425.12
  4. Step 4: Simplify right side
    20,856.49x = 328,834,033.55
  5. Step 5: Solve for x
    x = 328,834,033.55/20,856.49
  6. Step 6: Final answer
    x = 15,766.51

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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.