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Finding the Fourth Proportional to 303.55, 418.89 and 172.58

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Solution

The fourth proportional to 303.55, 418.89 and 172.58 is: 238.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.55 : 418.89 = 172.58 : x
  2. Step 2: Convert to fraction form
    303.55/418.89 = 172.58/x
  3. Step 3: Cross multiply
    303.55x = 418.89 × 172.58
  4. Step 4: Simplify right side
    303.55x = 72,291.97
  5. Step 5: Solve for x
    x = 72,291.97/303.55
  6. Step 6: Final answer
    x = 238.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.