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Finding the Fourth Proportional to 319.75, 478.34 and 276.89

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Solution

The fourth proportional to 319.75, 478.34 and 276.89 is: 414.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.75 : 478.34 = 276.89 : x
  2. Step 2: Convert to fraction form
    319.75/478.34 = 276.89/x
  3. Step 3: Cross multiply
    319.75x = 478.34 × 276.89
  4. Step 4: Simplify right side
    319.75x = 132,444.82
  5. Step 5: Solve for x
    x = 132,444.82/319.75
  6. Step 6: Final answer
    x = 414.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.