Home / 21,269.80-31,905.92-6,479.20

Finding the Fourth Proportional to 21,269.80, 31,905.92 and 6,479.20

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Solution

The fourth proportional to 21,269.80, 31,905.92 and 6,479.20 is: 9,719.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,269.80 : 31,905.92 = 6,479.20 : x
  2. Step 2: Convert to fraction form
    21,269.80/31,905.92 = 6,479.20/x
  3. Step 3: Cross multiply
    21,269.80x = 31,905.92 × 6,479.20
  4. Step 4: Simplify right side
    21,269.80x = 206,724,836.86
  5. Step 5: Solve for x
    x = 206,724,836.86/21,269.80
  6. Step 6: Final answer
    x = 9,719.17

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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.