Home / 20,760.24-31,148.40-7,621.68

Finding the Fourth Proportional to 20,760.24, 31,148.40 and 7,621.68

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Solution

The fourth proportional to 20,760.24, 31,148.40 and 7,621.68 is: 11,435.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,760.24 : 31,148.40 = 7,621.68 : x
  2. Step 2: Convert to fraction form
    20,760.24/31,148.40 = 7,621.68/x
  3. Step 3: Cross multiply
    20,760.24x = 31,148.40 × 7,621.68
  4. Step 4: Simplify right side
    20,760.24x = 237,403,137.31
  5. Step 5: Solve for x
    x = 237,403,137.31/20,760.24
  6. Step 6: Final answer
    x = 11,435.47

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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.