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Finding the Fourth Proportional to 355.25, 533.18 and 172.70

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Solution

The fourth proportional to 355.25, 533.18 and 172.70 is: 259.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.25 : 533.18 = 172.70 : x
  2. Step 2: Convert to fraction form
    355.25/533.18 = 172.70/x
  3. Step 3: Cross multiply
    355.25x = 533.18 × 172.70
  4. Step 4: Simplify right side
    355.25x = 92,079.95
  5. Step 5: Solve for x
    x = 92,079.95/355.25
  6. Step 6: Final answer
    x = 259.20

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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.