Home / 20,821.76-31,244.96-7,683.28

Finding the Fourth Proportional to 20,821.76, 31,244.96 and 7,683.28

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Solution

The fourth proportional to 20,821.76, 31,244.96 and 7,683.28 is: 11,529.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.76 : 31,244.96 = 7,683.28 : x
  2. Step 2: Convert to fraction form
    20,821.76/31,244.96 = 7,683.28/x
  3. Step 3: Cross multiply
    20,821.76x = 31,244.96 × 7,683.28
  4. Step 4: Simplify right side
    20,821.76x = 240,063,776.27
  5. Step 5: Solve for x
    x = 240,063,776.27/20,821.76
  6. Step 6: Final answer
    x = 11,529.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.