Home / 3,897.90-5,380.79-2,642.60

Finding the Fourth Proportional to 3,897.90, 5,380.79 and 2,642.60

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Solution

The fourth proportional to 3,897.90, 5,380.79 and 2,642.60 is: 3,647.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.90 : 5,380.79 = 2,642.60 : x
  2. Step 2: Convert to fraction form
    3,897.90/5,380.79 = 2,642.60/x
  3. Step 3: Cross multiply
    3,897.90x = 5,380.79 × 2,642.60
  4. Step 4: Simplify right side
    3,897.90x = 14,219,253.95
  5. Step 5: Solve for x
    x = 14,219,253.95/3,897.90
  6. Step 6: Final answer
    x = 3,647.93

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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.