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Finding the Fourth Proportional to 660.99, 989.90 and 367.76

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Solution

The fourth proportional to 660.99, 989.90 and 367.76 is: 550.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.99 : 989.90 = 367.76 : x
  2. Step 2: Convert to fraction form
    660.99/989.90 = 367.76/x
  3. Step 3: Cross multiply
    660.99x = 989.90 × 367.76
  4. Step 4: Simplify right side
    660.99x = 364,046.54
  5. Step 5: Solve for x
    x = 364,046.54/660.99
  6. Step 6: Final answer
    x = 550.76

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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.