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Finding the Fourth Proportional to 270.56, 405.58 and 172.76

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Solution

The fourth proportional to 270.56, 405.58 and 172.76 is: 258.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.56 : 405.58 = 172.76 : x
  2. Step 2: Convert to fraction form
    270.56/405.58 = 172.76/x
  3. Step 3: Cross multiply
    270.56x = 405.58 × 172.76
  4. Step 4: Simplify right side
    270.56x = 70,068.58
  5. Step 5: Solve for x
    x = 70,068.58/270.56
  6. Step 6: Final answer
    x = 258.97

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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.