Home / 20,679.40-31,020.02-6,640

Finding the Fourth Proportional to 20,679.40, 31,020.02 and 6,640

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Solution

The fourth proportional to 20,679.40, 31,020.02 and 6,640 is: 9,960.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679.40 : 31,020.02 = 6,640 : x
  2. Step 2: Convert to fraction form
    20,679.40/31,020.02 = 6,640/x
  3. Step 3: Cross multiply
    20,679.40x = 31,020.02 × 6,640
  4. Step 4: Simplify right side
    20,679.40x = 205,972,932.80
  5. Step 5: Solve for x
    x = 205,972,932.80/20,679.40
  6. Step 6: Final answer
    x = 9,960.30

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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.