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Finding the Fourth Proportional to 1,392.80, 1,922.09 and 763.34

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Solution

The fourth proportional to 1,392.80, 1,922.09 and 763.34 is: 1,053.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.80 : 1,922.09 = 763.34 : x
  2. Step 2: Convert to fraction form
    1,392.80/1,922.09 = 763.34/x
  3. Step 3: Cross multiply
    1,392.80x = 1,922.09 × 763.34
  4. Step 4: Simplify right side
    1,392.80x = 1,467,194.75
  5. Step 5: Solve for x
    x = 1,467,194.75/1,392.80
  6. Step 6: Final answer
    x = 1,053.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.