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Finding the Fourth Proportional to 661.48, 992.42 and 228.68

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Solution

The fourth proportional to 661.48, 992.42 and 228.68 is: 343.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.48 : 992.42 = 228.68 : x
  2. Step 2: Convert to fraction form
    661.48/992.42 = 228.68/x
  3. Step 3: Cross multiply
    661.48x = 992.42 × 228.68
  4. Step 4: Simplify right side
    661.48x = 226,946.61
  5. Step 5: Solve for x
    x = 226,946.61/661.48
  6. Step 6: Final answer
    x = 343.09

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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.