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Finding the Fourth Proportional to 119.55, 178.36 and 115.46

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Solution

The fourth proportional to 119.55, 178.36 and 115.46 is: 172.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.55 : 178.36 = 115.46 : x
  2. Step 2: Convert to fraction form
    119.55/178.36 = 115.46/x
  3. Step 3: Cross multiply
    119.55x = 178.36 × 115.46
  4. Step 4: Simplify right side
    119.55x = 20,592.93
  5. Step 5: Solve for x
    x = 20,592.93/119.55
  6. Step 6: Final answer
    x = 172.25

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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.