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Finding the Fourth Proportional to 1,940.02, 2,909.40 and 641.23

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Solution

The fourth proportional to 1,940.02, 2,909.40 and 641.23 is: 961.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.02 : 2,909.40 = 641.23 : x
  2. Step 2: Convert to fraction form
    1,940.02/2,909.40 = 641.23/x
  3. Step 3: Cross multiply
    1,940.02x = 2,909.40 × 641.23
  4. Step 4: Simplify right side
    1,940.02x = 1,865,594.56
  5. Step 5: Solve for x
    x = 1,865,594.56/1,940.02
  6. Step 6: Final answer
    x = 961.64

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1.5x scale

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.