Home / 1,420.37-2,131.23-640.92

Finding the Fourth Proportional to 1,420.37, 2,131.23 and 640.92

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Solution

The fourth proportional to 1,420.37, 2,131.23 and 640.92 is: 961.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.37 : 2,131.23 = 640.92 : x
  2. Step 2: Convert to fraction form
    1,420.37/2,131.23 = 640.92/x
  3. Step 3: Cross multiply
    1,420.37x = 2,131.23 × 640.92
  4. Step 4: Simplify right side
    1,420.37x = 1,365,947.93
  5. Step 5: Solve for x
    x = 1,365,947.93/1,420.37
  6. Step 6: Final answer
    x = 961.69

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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.