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Finding the Fourth Proportional to 354.66, 531.20 and 172.18

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Solution

The fourth proportional to 354.66, 531.20 and 172.18 is: 257.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.66 : 531.20 = 172.18 : x
  2. Step 2: Convert to fraction form
    354.66/531.20 = 172.18/x
  3. Step 3: Cross multiply
    354.66x = 531.20 × 172.18
  4. Step 4: Simplify right side
    354.66x = 91,462.02
  5. Step 5: Solve for x
    x = 91,462.02/354.66
  6. Step 6: Final answer
    x = 257.89

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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.