Home / 3,897.48-5,378.32-2,128.74

Finding the Fourth Proportional to 3,897.48, 5,378.32 and 2,128.74

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Solution

The fourth proportional to 3,897.48, 5,378.32 and 2,128.74 is: 2,937.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.48 : 5,378.32 = 2,128.74 : x
  2. Step 2: Convert to fraction form
    3,897.48/5,378.32 = 2,128.74/x
  3. Step 3: Cross multiply
    3,897.48x = 5,378.32 × 2,128.74
  4. Step 4: Simplify right side
    3,897.48x = 11,449,044.92
  5. Step 5: Solve for x
    x = 11,449,044.92/3,897.48
  6. Step 6: Final answer
    x = 2,937.55

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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.