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Finding the Fourth Proportional to 407.11, 561.75 and 239.00

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Solution

The fourth proportional to 407.11, 561.75 and 239.00 is: 329.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.11 : 561.75 = 239.00 : x
  2. Step 2: Convert to fraction form
    407.11/561.75 = 239.00/x
  3. Step 3: Cross multiply
    407.11x = 561.75 × 239.00
  4. Step 4: Simplify right side
    407.11x = 134,258.44
  5. Step 5: Solve for x
    x = 134,258.44/407.11
  6. Step 6: Final answer
    x = 329.78

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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.