Home / 20,720.67-31,080.69-5,138.30

Finding the Fourth Proportional to 20,720.67, 31,080.69 and 5,138.30

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Solution

The fourth proportional to 20,720.67, 31,080.69 and 5,138.30 is: 7,707.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.67 : 31,080.69 = 5,138.30 : x
  2. Step 2: Convert to fraction form
    20,720.67/31,080.69 = 5,138.30/x
  3. Step 3: Cross multiply
    20,720.67x = 31,080.69 × 5,138.30
  4. Step 4: Simplify right side
    20,720.67x = 159,701,909.43
  5. Step 5: Solve for x
    x = 159,701,909.43/20,720.67
  6. Step 6: Final answer
    x = 7,707.37

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1.5x scale

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.