Home / 3,878.40-5,354.76-2,980.54

Finding the Fourth Proportional to 3,878.40, 5,354.76 and 2,980.54

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Solution

The fourth proportional to 3,878.40, 5,354.76 and 2,980.54 is: 4,115.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,878.40 : 5,354.76 = 2,980.54 : x
  2. Step 2: Convert to fraction form
    3,878.40/5,354.76 = 2,980.54/x
  3. Step 3: Cross multiply
    3,878.40x = 5,354.76 × 2,980.54
  4. Step 4: Simplify right side
    3,878.40x = 15,960,034.69
  5. Step 5: Solve for x
    x = 15,960,034.69/3,878.40
  6. Step 6: Final answer
    x = 4,115.11

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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.