Home / 20,930.53-31,395.38-6,139.12

Finding the Fourth Proportional to 20,930.53, 31,395.38 and 6,139.12

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Solution

The fourth proportional to 20,930.53, 31,395.38 and 6,139.12 is: 9,208.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.53 : 31,395.38 = 6,139.12 : x
  2. Step 2: Convert to fraction form
    20,930.53/31,395.38 = 6,139.12/x
  3. Step 3: Cross multiply
    20,930.53x = 31,395.38 × 6,139.12
  4. Step 4: Simplify right side
    20,930.53x = 192,739,817.59
  5. Step 5: Solve for x
    x = 192,739,817.59/20,930.53
  6. Step 6: Final answer
    x = 9,208.55

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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.