Home / 5,111.28-7,055.64-3,121.20

Finding the Fourth Proportional to 5,111.28, 7,055.64 and 3,121.20

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Solution

The fourth proportional to 5,111.28, 7,055.64 and 3,121.20 is: 4,308.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,111.28 : 7,055.64 = 3,121.20 : x
  2. Step 2: Convert to fraction form
    5,111.28/7,055.64 = 3,121.20/x
  3. Step 3: Cross multiply
    5,111.28x = 7,055.64 × 3,121.20
  4. Step 4: Simplify right side
    5,111.28x = 22,022,063.57
  5. Step 5: Solve for x
    x = 22,022,063.57/5,111.28
  6. Step 6: Final answer
    x = 4,308.52

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Half scale
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Double scale
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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.