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Finding the Fourth Proportional to 117.12, 174.48 and 115.84

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Solution

The fourth proportional to 117.12, 174.48 and 115.84 is: 172.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.12 : 174.48 = 115.84 : x
  2. Step 2: Convert to fraction form
    117.12/174.48 = 115.84/x
  3. Step 3: Cross multiply
    117.12x = 174.48 × 115.84
  4. Step 4: Simplify right side
    117.12x = 20,211.76
  5. Step 5: Solve for x
    x = 20,211.76/117.12
  6. Step 6: Final answer
    x = 172.57

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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.