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Finding the Fourth Proportional to 115.20, 173.04 and 91.32

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Solution

The fourth proportional to 115.20, 173.04 and 91.32 is: 137.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.20 : 173.04 = 91.32 : x
  2. Step 2: Convert to fraction form
    115.20/173.04 = 91.32/x
  3. Step 3: Cross multiply
    115.20x = 173.04 × 91.32
  4. Step 4: Simplify right side
    115.20x = 15,802.01
  5. Step 5: Solve for x
    x = 15,802.01/115.20
  6. Step 6: Final answer
    x = 137.17

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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.