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Finding the Fourth Proportional to 115.54, 172.21 and 91.06

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Solution

The fourth proportional to 115.54, 172.21 and 91.06 is: 135.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.54 : 172.21 = 91.06 : x
  2. Step 2: Convert to fraction form
    115.54/172.21 = 91.06/x
  3. Step 3: Cross multiply
    115.54x = 172.21 × 91.06
  4. Step 4: Simplify right side
    115.54x = 15,680.99
  5. Step 5: Solve for x
    x = 15,680.99/115.54
  6. Step 6: Final answer
    x = 135.72

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These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.