Home / 20,490.20-30,731.10-5,695.40

Finding the Fourth Proportional to 20,490.20, 30,731.10 and 5,695.40

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Solution

The fourth proportional to 20,490.20, 30,731.10 and 5,695.40 is: 8,541.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.20 : 30,731.10 = 5,695.40 : x
  2. Step 2: Convert to fraction form
    20,490.20/30,731.10 = 5,695.40/x
  3. Step 3: Cross multiply
    20,490.20x = 30,731.10 × 5,695.40
  4. Step 4: Simplify right side
    20,490.20x = 175,025,906.94
  5. Step 5: Solve for x
    x = 175,025,906.94/20,490.20
  6. Step 6: Final answer
    x = 8,541.93

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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.