Home / 20,742.09-31,113.16-5,159.72

Finding the Fourth Proportional to 20,742.09, 31,113.16 and 5,159.72

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Solution

The fourth proportional to 20,742.09, 31,113.16 and 5,159.72 is: 7,739.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.09 : 31,113.16 = 5,159.72 : x
  2. Step 2: Convert to fraction form
    20,742.09/31,113.16 = 5,159.72/x
  3. Step 3: Cross multiply
    20,742.09x = 31,113.16 × 5,159.72
  4. Step 4: Simplify right side
    20,742.09x = 160,535,193.92
  5. Step 5: Solve for x
    x = 160,535,193.92/20,742.09
  6. Step 6: Final answer
    x = 7,739.59

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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.