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Finding the Fourth Proportional to 660.67, 990.88 and 270.59

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Solution

The fourth proportional to 660.67, 990.88 and 270.59 is: 405.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.67 : 990.88 = 270.59 : x
  2. Step 2: Convert to fraction form
    660.67/990.88 = 270.59/x
  3. Step 3: Cross multiply
    660.67x = 990.88 × 270.59
  4. Step 4: Simplify right side
    660.67x = 268,116.59
  5. Step 5: Solve for x
    x = 268,116.59/660.67
  6. Step 6: Final answer
    x = 405.83

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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.