Home / 3,712.78-5,123.40-2,140.75

Finding the Fourth Proportional to 3,712.78, 5,123.40 and 2,140.75

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Solution

The fourth proportional to 3,712.78, 5,123.40 and 2,140.75 is: 2,954.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,712.78 : 5,123.40 = 2,140.75 : x
  2. Step 2: Convert to fraction form
    3,712.78/5,123.40 = 2,140.75/x
  3. Step 3: Cross multiply
    3,712.78x = 5,123.40 × 2,140.75
  4. Step 4: Simplify right side
    3,712.78x = 10,967,918.55
  5. Step 5: Solve for x
    x = 10,967,918.55/3,712.78
  6. Step 6: Final answer
    x = 2,954.10

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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.