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Finding the Fourth Proportional to 115.16, 172.57 and 89.38

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Solution

The fourth proportional to 115.16, 172.57 and 89.38 is: 133.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.16 : 172.57 = 89.38 : x
  2. Step 2: Convert to fraction form
    115.16/172.57 = 89.38/x
  3. Step 3: Cross multiply
    115.16x = 172.57 × 89.38
  4. Step 4: Simplify right side
    115.16x = 15,424.31
  5. Step 5: Solve for x
    x = 15,424.31/115.16
  6. Step 6: Final answer
    x = 133.94

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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.