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Finding the Fourth Proportional to 660.50, 911.94 and 439.70

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Solution

The fourth proportional to 660.50, 911.94 and 439.70 is: 607.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.50 : 911.94 = 439.70 : x
  2. Step 2: Convert to fraction form
    660.50/911.94 = 439.70/x
  3. Step 3: Cross multiply
    660.50x = 911.94 × 439.70
  4. Step 4: Simplify right side
    660.50x = 400,980.02
  5. Step 5: Solve for x
    x = 400,980.02/660.50
  6. Step 6: Final answer
    x = 607.09

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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.