Home / 3,897.80-5,378.92-2,405.12

Finding the Fourth Proportional to 3,897.80, 5,378.92 and 2,405.12

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Solution

The fourth proportional to 3,897.80, 5,378.92 and 2,405.12 is: 3,319.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.80 : 5,378.92 = 2,405.12 : x
  2. Step 2: Convert to fraction form
    3,897.80/5,378.92 = 2,405.12/x
  3. Step 3: Cross multiply
    3,897.80x = 5,378.92 × 2,405.12
  4. Step 4: Simplify right side
    3,897.80x = 12,936,948.07
  5. Step 5: Solve for x
    x = 12,936,948.07/3,897.80
  6. Step 6: Final answer
    x = 3,319.04

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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.