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Finding the Fourth Proportional to 662.73, 914.76 and 393.80

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Solution

The fourth proportional to 662.73, 914.76 and 393.80 is: 543.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.73 : 914.76 = 393.80 : x
  2. Step 2: Convert to fraction form
    662.73/914.76 = 393.80/x
  3. Step 3: Cross multiply
    662.73x = 914.76 × 393.80
  4. Step 4: Simplify right side
    662.73x = 360,227.91
  5. Step 5: Solve for x
    x = 360,227.91/662.73
  6. Step 6: Final answer
    x = 543.55

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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.