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Finding the Fourth Proportional to 319.11, 478.71 and 172.81

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Solution

The fourth proportional to 319.11, 478.71 and 172.81 is: 259.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.11 : 478.71 = 172.81 : x
  2. Step 2: Convert to fraction form
    319.11/478.71 = 172.81/x
  3. Step 3: Cross multiply
    319.11x = 478.71 × 172.81
  4. Step 4: Simplify right side
    319.11x = 82,725.88
  5. Step 5: Solve for x
    x = 82,725.88/319.11
  6. Step 6: Final answer
    x = 259.24

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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.