Home / 5,115.78-7,059.60-2,877.72

Finding the Fourth Proportional to 5,115.78, 7,059.60 and 2,877.72

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Solution

The fourth proportional to 5,115.78, 7,059.60 and 2,877.72 is: 3,971.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115.78 : 7,059.60 = 2,877.72 : x
  2. Step 2: Convert to fraction form
    5,115.78/7,059.60 = 2,877.72/x
  3. Step 3: Cross multiply
    5,115.78x = 7,059.60 × 2,877.72
  4. Step 4: Simplify right side
    5,115.78x = 20,315,552.11
  5. Step 5: Solve for x
    x = 20,315,552.11/5,115.78
  6. Step 6: Final answer
    x = 3,971.15

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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.