Home / 20,720.18-31,080.25-5,137.80

Finding the Fourth Proportional to 20,720.18, 31,080.25 and 5,137.80

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Solution

The fourth proportional to 20,720.18, 31,080.25 and 5,137.80 is: 7,706.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.18 : 31,080.25 = 5,137.80 : x
  2. Step 2: Convert to fraction form
    20,720.18/31,080.25 = 5,137.80/x
  3. Step 3: Cross multiply
    20,720.18x = 31,080.25 × 5,137.80
  4. Step 4: Simplify right side
    20,720.18x = 159,684,082.76
  5. Step 5: Solve for x
    x = 159,684,082.76/20,720.18
  6. Step 6: Final answer
    x = 7,706.70

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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.