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Finding the Fourth Proportional to 660.66, 911.86 and 439.62

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Solution

The fourth proportional to 660.66, 911.86 and 439.62 is: 606.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.66 : 911.86 = 439.62 : x
  2. Step 2: Convert to fraction form
    660.66/911.86 = 439.62/x
  3. Step 3: Cross multiply
    660.66x = 911.86 × 439.62
  4. Step 4: Simplify right side
    660.66x = 400,871.89
  5. Step 5: Solve for x
    x = 400,871.89/660.66
  6. Step 6: Final answer
    x = 606.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.