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Finding the Fourth Proportional to 660.95, 991.43 and 228

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Solution

The fourth proportional to 660.95, 991.43 and 228 is: 342.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.95 : 991.43 = 228 : x
  2. Step 2: Convert to fraction form
    660.95/991.43 = 228/x
  3. Step 3: Cross multiply
    660.95x = 991.43 × 228
  4. Step 4: Simplify right side
    660.95x = 226,044.90
  5. Step 5: Solve for x
    x = 226,044.90/660.95
  6. Step 6: Final answer
    x = 342.00

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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.