Home / 3,897.30-5,378.38-2,128.94

Finding the Fourth Proportional to 3,897.30, 5,378.38 and 2,128.94

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Solution

The fourth proportional to 3,897.30, 5,378.38 and 2,128.94 is: 2,938.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.30 : 5,378.38 = 2,128.94 : x
  2. Step 2: Convert to fraction form
    3,897.30/5,378.38 = 2,128.94/x
  3. Step 3: Cross multiply
    3,897.30x = 5,378.38 × 2,128.94
  4. Step 4: Simplify right side
    3,897.30x = 11,450,248.32
  5. Step 5: Solve for x
    x = 11,450,248.32/3,897.30
  6. Step 6: Final answer
    x = 2,938.00

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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.