Home / 20,776.24-31,156.15-7,621.43

Finding the Fourth Proportional to 20,776.24, 31,156.15 and 7,621.43

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Solution

The fourth proportional to 20,776.24, 31,156.15 and 7,621.43 is: 11,429.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,776.24 : 31,156.15 = 7,621.43 : x
  2. Step 2: Convert to fraction form
    20,776.24/31,156.15 = 7,621.43/x
  3. Step 3: Cross multiply
    20,776.24x = 31,156.15 × 7,621.43
  4. Step 4: Simplify right side
    20,776.24x = 237,454,378.19
  5. Step 5: Solve for x
    x = 237,454,378.19/20,776.24
  6. Step 6: Final answer
    x = 11,429.13

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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.