Home / 3,897.19-5,378.02-2,128.78

Finding the Fourth Proportional to 3,897.19, 5,378.02 and 2,128.78

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Solution

The fourth proportional to 3,897.19, 5,378.02 and 2,128.78 is: 2,937.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.19 : 5,378.02 = 2,128.78 : x
  2. Step 2: Convert to fraction form
    3,897.19/5,378.02 = 2,128.78/x
  3. Step 3: Cross multiply
    3,897.19x = 5,378.02 × 2,128.78
  4. Step 4: Simplify right side
    3,897.19x = 11,448,621.42
  5. Step 5: Solve for x
    x = 11,448,621.42/3,897.19
  6. Step 6: Final answer
    x = 2,937.66

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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.