Home / 5,120.91-7,065.27-3,129.39

Finding the Fourth Proportional to 5,120.91, 7,065.27 and 3,129.39

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Solution

The fourth proportional to 5,120.91, 7,065.27 and 3,129.39 is: 4,317.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.91 : 7,065.27 = 3,129.39 : x
  2. Step 2: Convert to fraction form
    5,120.91/7,065.27 = 3,129.39/x
  3. Step 3: Cross multiply
    5,120.91x = 7,065.27 × 3,129.39
  4. Step 4: Simplify right side
    5,120.91x = 22,109,985.29
  5. Step 5: Solve for x
    x = 22,109,985.29/5,120.91
  6. Step 6: Final answer
    x = 4,317.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.