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Finding the Fourth Proportional to 319.51, 478.99 and 127

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Solution

The fourth proportional to 319.51, 478.99 and 127 is: 190.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.51 : 478.99 = 127 : x
  2. Step 2: Convert to fraction form
    319.51/478.99 = 127/x
  3. Step 3: Cross multiply
    319.51x = 478.99 × 127
  4. Step 4: Simplify right side
    319.51x = 60,831.73
  5. Step 5: Solve for x
    x = 60,831.73/319.51
  6. Step 6: Final answer
    x = 190.39

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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.