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Finding the Fourth Proportional to 660.09, 989.86 and 249

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Solution

The fourth proportional to 660.09, 989.86 and 249 is: 373.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.09 : 989.86 = 249 : x
  2. Step 2: Convert to fraction form
    660.09/989.86 = 249/x
  3. Step 3: Cross multiply
    660.09x = 989.86 × 249
  4. Step 4: Simplify right side
    660.09x = 246,475.14
  5. Step 5: Solve for x
    x = 246,475.14/660.09
  6. Step 6: Final answer
    x = 373.40

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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.