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Finding the Fourth Proportional to 316.80, 475.18 and 172.80

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Solution

The fourth proportional to 316.80, 475.18 and 172.80 is: 259.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.80 : 475.18 = 172.80 : x
  2. Step 2: Convert to fraction form
    316.80/475.18 = 172.80/x
  3. Step 3: Cross multiply
    316.80x = 475.18 × 172.80
  4. Step 4: Simplify right side
    316.80x = 82,111.10
  5. Step 5: Solve for x
    x = 82,111.10/316.80
  6. Step 6: Final answer
    x = 259.19

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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.