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Finding the Fourth Proportional to 660.76, 990.43 and 336.15

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Solution

The fourth proportional to 660.76, 990.43 and 336.15 is: 503.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.76 : 990.43 = 336.15 : x
  2. Step 2: Convert to fraction form
    660.76/990.43 = 336.15/x
  3. Step 3: Cross multiply
    660.76x = 990.43 × 336.15
  4. Step 4: Simplify right side
    660.76x = 332,932.20
  5. Step 5: Solve for x
    x = 332,932.20/660.76
  6. Step 6: Final answer
    x = 503.86

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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.