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Finding the Fourth Proportional to 253.31, 379.80 and 172.19

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Solution

The fourth proportional to 253.31, 379.80 and 172.19 is: 258.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.31 : 379.80 = 172.19 : x
  2. Step 2: Convert to fraction form
    253.31/379.80 = 172.19/x
  3. Step 3: Cross multiply
    253.31x = 379.80 × 172.19
  4. Step 4: Simplify right side
    253.31x = 65,398.71
  5. Step 5: Solve for x
    x = 65,398.71/253.31
  6. Step 6: Final answer
    x = 258.18

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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.