Home / 20,772.18-31,138.83-7,621.02

Finding the Fourth Proportional to 20,772.18, 31,138.83 and 7,621.02

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Solution

The fourth proportional to 20,772.18, 31,138.83 and 7,621.02 is: 11,424.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.18 : 31,138.83 = 7,621.02 : x
  2. Step 2: Convert to fraction form
    20,772.18/31,138.83 = 7,621.02/x
  3. Step 3: Cross multiply
    20,772.18x = 31,138.83 × 7,621.02
  4. Step 4: Simplify right side
    20,772.18x = 237,309,646.21
  5. Step 5: Solve for x
    x = 237,309,646.21/20,772.18
  6. Step 6: Final answer
    x = 11,424.40

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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.