Home / 20,742.17-31,113.19-5,159.80

Finding the Fourth Proportional to 20,742.17, 31,113.19 and 5,159.80

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Solution

The fourth proportional to 20,742.17, 31,113.19 and 5,159.80 is: 7,739.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.17 : 31,113.19 = 5,159.80 : x
  2. Step 2: Convert to fraction form
    20,742.17/31,113.19 = 5,159.80/x
  3. Step 3: Cross multiply
    20,742.17x = 31,113.19 × 5,159.80
  4. Step 4: Simplify right side
    20,742.17x = 160,537,682.20
  5. Step 5: Solve for x
    x = 160,537,682.20/20,742.17
  6. Step 6: Final answer
    x = 7,739.68

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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.