Home / 1,427.18-2,140.70-453.20

Finding the Fourth Proportional to 1,427.18, 2,140.70 and 453.20

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Solution

The fourth proportional to 1,427.18, 2,140.70 and 453.20 is: 679.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.18 : 2,140.70 = 453.20 : x
  2. Step 2: Convert to fraction form
    1,427.18/2,140.70 = 453.20/x
  3. Step 3: Cross multiply
    1,427.18x = 2,140.70 × 453.20
  4. Step 4: Simplify right side
    1,427.18x = 970,165.24
  5. Step 5: Solve for x
    x = 970,165.24/1,427.18
  6. Step 6: Final answer
    x = 679.78

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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.