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Finding the Fourth Proportional to 662.70, 992.82 and 387.99

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Solution

The fourth proportional to 662.70, 992.82 and 387.99 is: 581.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.70 : 992.82 = 387.99 : x
  2. Step 2: Convert to fraction form
    662.70/992.82 = 387.99/x
  3. Step 3: Cross multiply
    662.70x = 992.82 × 387.99
  4. Step 4: Simplify right side
    662.70x = 385,204.23
  5. Step 5: Solve for x
    x = 385,204.23/662.70
  6. Step 6: Final answer
    x = 581.26

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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.