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Finding the Fourth Proportional to 115.82, 172.62 and 115.64

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Solution

The fourth proportional to 115.82, 172.62 and 115.64 is: 172.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.82 : 172.62 = 115.64 : x
  2. Step 2: Convert to fraction form
    115.82/172.62 = 115.64/x
  3. Step 3: Cross multiply
    115.82x = 172.62 × 115.64
  4. Step 4: Simplify right side
    115.82x = 19,961.20
  5. Step 5: Solve for x
    x = 19,961.20/115.82
  6. Step 6: Final answer
    x = 172.35

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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.