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Finding the Fourth Proportional to 305.54, 421.58 and 172.76

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Solution

The fourth proportional to 305.54, 421.58 and 172.76 is: 238.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.54 : 421.58 = 172.76 : x
  2. Step 2: Convert to fraction form
    305.54/421.58 = 172.76/x
  3. Step 3: Cross multiply
    305.54x = 421.58 × 172.76
  4. Step 4: Simplify right side
    305.54x = 72,832.16
  5. Step 5: Solve for x
    x = 72,832.16/305.54
  6. Step 6: Final answer
    x = 238.37

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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.