Home / 20,856.29-28,781.53-11,424.65

Finding the Fourth Proportional to 20,856.29, 28,781.53 and 11,424.65

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Solution

The fourth proportional to 20,856.29, 28,781.53 and 11,424.65 is: 15,765.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.29 : 28,781.53 = 11,424.65 : x
  2. Step 2: Convert to fraction form
    20,856.29/28,781.53 = 11,424.65/x
  3. Step 3: Cross multiply
    20,856.29x = 28,781.53 × 11,424.65
  4. Step 4: Simplify right side
    20,856.29x = 328,818,734.25
  5. Step 5: Solve for x
    x = 328,818,734.25/20,856.29
  6. Step 6: Final answer
    x = 15,765.93

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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.