Home / 5,155.91-7,115.05-3,138.59

Finding the Fourth Proportional to 5,155.91, 7,115.05 and 3,138.59

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Solution

The fourth proportional to 5,155.91, 7,115.05 and 3,138.59 is: 4,331.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,155.91 : 7,115.05 = 3,138.59 : x
  2. Step 2: Convert to fraction form
    5,155.91/7,115.05 = 3,138.59/x
  3. Step 3: Cross multiply
    5,155.91x = 7,115.05 × 3,138.59
  4. Step 4: Simplify right side
    5,155.91x = 22,331,173.51
  5. Step 5: Solve for x
    x = 22,331,173.51/5,155.91
  6. Step 6: Final answer
    x = 4,331.18

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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.