Home / 3,121.52-4,305.48-2,125.28

Finding the Fourth Proportional to 3,121.52, 4,305.48 and 2,125.28

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Solution

The fourth proportional to 3,121.52, 4,305.48 and 2,125.28 is: 2,931.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.52 : 4,305.48 = 2,125.28 : x
  2. Step 2: Convert to fraction form
    3,121.52/4,305.48 = 2,125.28/x
  3. Step 3: Cross multiply
    3,121.52x = 4,305.48 × 2,125.28
  4. Step 4: Simplify right side
    3,121.52x = 9,150,350.53
  5. Step 5: Solve for x
    x = 9,150,350.53/3,121.52
  6. Step 6: Final answer
    x = 2,931.38

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Half scale
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Double scale
Find fourth proportional to 3,122.52, 4,306.86 and 2,126.28
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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.