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Finding the Fourth Proportional to 319.76, 440.40 and 276.08

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Solution

The fourth proportional to 319.76, 440.40 and 276.08 is: 380.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.76 : 440.40 = 276.08 : x
  2. Step 2: Convert to fraction form
    319.76/440.40 = 276.08/x
  3. Step 3: Cross multiply
    319.76x = 440.40 × 276.08
  4. Step 4: Simplify right side
    319.76x = 121,585.63
  5. Step 5: Solve for x
    x = 121,585.63/319.76
  6. Step 6: Final answer
    x = 380.24

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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.