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Finding the Fourth Proportional to 135.96, 202.96 and 115.45

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Solution

The fourth proportional to 135.96, 202.96 and 115.45 is: 172.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.96 : 202.96 = 115.45 : x
  2. Step 2: Convert to fraction form
    135.96/202.96 = 115.45/x
  3. Step 3: Cross multiply
    135.96x = 202.96 × 115.45
  4. Step 4: Simplify right side
    135.96x = 23,430.72
  5. Step 5: Solve for x
    x = 23,430.72/135.96
  6. Step 6: Final answer
    x = 172.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.