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Finding the Fourth Proportional to 661.55, 992.32 and 228.70

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Solution

The fourth proportional to 661.55, 992.32 and 228.70 is: 343.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.55 : 992.32 = 228.70 : x
  2. Step 2: Convert to fraction form
    661.55/992.32 = 228.70/x
  3. Step 3: Cross multiply
    661.55x = 992.32 × 228.70
  4. Step 4: Simplify right side
    661.55x = 226,940.53
  5. Step 5: Solve for x
    x = 226,940.53/661.55
  6. Step 6: Final answer
    x = 343.04

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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.