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Finding the Fourth Proportional to 319.18, 478.97 and 172.87

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Solution

The fourth proportional to 319.18, 478.97 and 172.87 is: 259.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.18 : 478.97 = 172.87 : x
  2. Step 2: Convert to fraction form
    319.18/478.97 = 172.87/x
  3. Step 3: Cross multiply
    319.18x = 478.97 × 172.87
  4. Step 4: Simplify right side
    319.18x = 82,796.28
  5. Step 5: Solve for x
    x = 82,796.28/319.18
  6. Step 6: Final answer
    x = 259.40

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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.