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Finding the Fourth Proportional to 319.72, 440.90 and 275.60

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Solution

The fourth proportional to 319.72, 440.90 and 275.60 is: 380.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.72 : 440.90 = 275.60 : x
  2. Step 2: Convert to fraction form
    319.72/440.90 = 275.60/x
  3. Step 3: Cross multiply
    319.72x = 440.90 × 275.60
  4. Step 4: Simplify right side
    319.72x = 121,512.04
  5. Step 5: Solve for x
    x = 121,512.04/319.72
  6. Step 6: Final answer
    x = 380.06

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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.