Home / 2,129.24-3,185.64-2,123.78

Finding the Fourth Proportional to 2,129.24, 3,185.64 and 2,123.78

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Solution

The fourth proportional to 2,129.24, 3,185.64 and 2,123.78 is: 3,177.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.24 : 3,185.64 = 2,123.78 : x
  2. Step 2: Convert to fraction form
    2,129.24/3,185.64 = 2,123.78/x
  3. Step 3: Cross multiply
    2,129.24x = 3,185.64 × 2,123.78
  4. Step 4: Simplify right side
    2,129.24x = 6,765,598.52
  5. Step 5: Solve for x
    x = 6,765,598.52/2,129.24
  6. Step 6: Final answer
    x = 3,177.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.