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Finding the Fourth Proportional to 660.06, 911.25 and 439.38

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Solution

The fourth proportional to 660.06, 911.25 and 439.38 is: 606.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.06 : 911.25 = 439.38 : x
  2. Step 2: Convert to fraction form
    660.06/911.25 = 439.38/x
  3. Step 3: Cross multiply
    660.06x = 911.25 × 439.38
  4. Step 4: Simplify right side
    660.06x = 400,385.03
  5. Step 5: Solve for x
    x = 400,385.03/660.06
  6. Step 6: Final answer
    x = 606.59

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Double scale
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1.5x scale

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.