Home / 3,820.78-5,275.42-2,639.80

Finding the Fourth Proportional to 3,820.78, 5,275.42 and 2,639.80

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Solution

The fourth proportional to 3,820.78, 5,275.42 and 2,639.80 is: 3,644.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,820.78 : 5,275.42 = 2,639.80 : x
  2. Step 2: Convert to fraction form
    3,820.78/5,275.42 = 2,639.80/x
  3. Step 3: Cross multiply
    3,820.78x = 5,275.42 × 2,639.80
  4. Step 4: Simplify right side
    3,820.78x = 13,926,053.71
  5. Step 5: Solve for x
    x = 13,926,053.71/3,820.78
  6. Step 6: Final answer
    x = 3,644.82

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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.