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Finding the Fourth Proportional to 1,399.93, 2,100.20 and 426.11

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Solution

The fourth proportional to 1,399.93, 2,100.20 and 426.11 is: 639.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.93 : 2,100.20 = 426.11 : x
  2. Step 2: Convert to fraction form
    1,399.93/2,100.20 = 426.11/x
  3. Step 3: Cross multiply
    1,399.93x = 2,100.20 × 426.11
  4. Step 4: Simplify right side
    1,399.93x = 894,903.59
  5. Step 5: Solve for x
    x = 894,903.59/1,399.93
  6. Step 6: Final answer
    x = 639.25

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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.