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Finding the Fourth Proportional to 661.96, 992.82 and 418.36

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Solution

The fourth proportional to 661.96, 992.82 and 418.36 is: 627.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.96 : 992.82 = 418.36 : x
  2. Step 2: Convert to fraction form
    661.96/992.82 = 418.36/x
  3. Step 3: Cross multiply
    661.96x = 992.82 × 418.36
  4. Step 4: Simplify right side
    661.96x = 415,356.18
  5. Step 5: Solve for x
    x = 415,356.18/661.96
  6. Step 6: Final answer
    x = 627.46

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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.