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Finding the Fourth Proportional to 319.55, 478.42 and 254.66

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Solution

The fourth proportional to 319.55, 478.42 and 254.66 is: 381.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.55 : 478.42 = 254.66 : x
  2. Step 2: Convert to fraction form
    319.55/478.42 = 254.66/x
  3. Step 3: Cross multiply
    319.55x = 478.42 × 254.66
  4. Step 4: Simplify right side
    319.55x = 121,831.41
  5. Step 5: Solve for x
    x = 121,831.41/319.55
  6. Step 6: Final answer
    x = 381.27

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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.