Home / 1,400.20-2,100.28-426.36

Finding the Fourth Proportional to 1,400.20, 2,100.28 and 426.36

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Solution

The fourth proportional to 1,400.20, 2,100.28 and 426.36 is: 639.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.20 : 2,100.28 = 426.36 : x
  2. Step 2: Convert to fraction form
    1,400.20/2,100.28 = 426.36/x
  3. Step 3: Cross multiply
    1,400.20x = 2,100.28 × 426.36
  4. Step 4: Simplify right side
    1,400.20x = 895,475.38
  5. Step 5: Solve for x
    x = 895,475.38/1,400.20
  6. Step 6: Final answer
    x = 639.53

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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.