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Finding the Fourth Proportional to 115.87, 172.96 and 98.63

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Solution

The fourth proportional to 115.87, 172.96 and 98.63 is: 147.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.87 : 172.96 = 98.63 : x
  2. Step 2: Convert to fraction form
    115.87/172.96 = 98.63/x
  3. Step 3: Cross multiply
    115.87x = 172.96 × 98.63
  4. Step 4: Simplify right side
    115.87x = 17,059.04
  5. Step 5: Solve for x
    x = 17,059.04/115.87
  6. Step 6: Final answer
    x = 147.23

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Why These Related Problems?

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