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Finding the Fourth Proportional to 115.37, 172.78 and 89.48

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Solution

The fourth proportional to 115.37, 172.78 and 89.48 is: 134.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.37 : 172.78 = 89.48 : x
  2. Step 2: Convert to fraction form
    115.37/172.78 = 89.48/x
  3. Step 3: Cross multiply
    115.37x = 172.78 × 89.48
  4. Step 4: Simplify right side
    115.37x = 15,460.01
  5. Step 5: Solve for x
    x = 15,460.01/115.37
  6. Step 6: Final answer
    x = 134.00

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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.