Home / 20,720.43-31,080.96-5,138.07

Finding the Fourth Proportional to 20,720.43, 31,080.96 and 5,138.07

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Solution

The fourth proportional to 20,720.43, 31,080.96 and 5,138.07 is: 7,707.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.43 : 31,080.96 = 5,138.07 : x
  2. Step 2: Convert to fraction form
    20,720.43/31,080.96 = 5,138.07/x
  3. Step 3: Cross multiply
    20,720.43x = 31,080.96 × 5,138.07
  4. Step 4: Simplify right side
    20,720.43x = 159,696,148.15
  5. Step 5: Solve for x
    x = 159,696,148.15/20,720.43
  6. Step 6: Final answer
    x = 7,707.18

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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.