Home / 20,742-28,624.64-11,311.17

Finding the Fourth Proportional to 20,742, 28,624.64 and 11,311.17

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Solution

The fourth proportional to 20,742, 28,624.64 and 11,311.17 is: 15,609.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742 : 28,624.64 = 11,311.17 : x
  2. Step 2: Convert to fraction form
    20,742/28,624.64 = 11,311.17/x
  3. Step 3: Cross multiply
    20,742x = 28,624.64 × 11,311.17
  4. Step 4: Simplify right side
    20,742x = 323,778,112.67
  5. Step 5: Solve for x
    x = 323,778,112.67/20,742
  6. Step 6: Final answer
    x = 15,609.78

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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.