Home / 1,428.14-2,140.81-453.55

Finding the Fourth Proportional to 1,428.14, 2,140.81 and 453.55

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Solution

The fourth proportional to 1,428.14, 2,140.81 and 453.55 is: 679.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.14 : 2,140.81 = 453.55 : x
  2. Step 2: Convert to fraction form
    1,428.14/2,140.81 = 453.55/x
  3. Step 3: Cross multiply
    1,428.14x = 2,140.81 × 453.55
  4. Step 4: Simplify right side
    1,428.14x = 970,964.38
  5. Step 5: Solve for x
    x = 970,964.38/1,428.14
  6. Step 6: Final answer
    x = 679.88

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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.