Home / 20,856.21-28,781.95-11,424.17

Finding the Fourth Proportional to 20,856.21, 28,781.95 and 11,424.17

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Solution

The fourth proportional to 20,856.21, 28,781.95 and 11,424.17 is: 15,765.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.21 : 28,781.95 = 11,424.17 : x
  2. Step 2: Convert to fraction form
    20,856.21/28,781.95 = 11,424.17/x
  3. Step 3: Cross multiply
    20,856.21x = 28,781.95 × 11,424.17
  4. Step 4: Simplify right side
    20,856.21x = 328,809,889.73
  5. Step 5: Solve for x
    x = 328,809,889.73/20,856.21
  6. Step 6: Final answer
    x = 15,765.56

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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.