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Finding the Fourth Proportional to 660.48, 990.62 and 221.69

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Solution

The fourth proportional to 660.48, 990.62 and 221.69 is: 332.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.48 : 990.62 = 221.69 : x
  2. Step 2: Convert to fraction form
    660.48/990.62 = 221.69/x
  3. Step 3: Cross multiply
    660.48x = 990.62 × 221.69
  4. Step 4: Simplify right side
    660.48x = 219,604.49
  5. Step 5: Solve for x
    x = 219,604.49/660.48
  6. Step 6: Final answer
    x = 332.49

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1.5x scale

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.