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Finding the Fourth Proportional to 115.19, 172.62 and 66.41

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Solution

The fourth proportional to 115.19, 172.62 and 66.41 is: 99.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.19 : 172.62 = 66.41 : x
  2. Step 2: Convert to fraction form
    115.19/172.62 = 66.41/x
  3. Step 3: Cross multiply
    115.19x = 172.62 × 66.41
  4. Step 4: Simplify right side
    115.19x = 11,463.56
  5. Step 5: Solve for x
    x = 11,463.56/115.19
  6. Step 6: Final answer
    x = 99.52

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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.