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Finding the Fourth Proportional to 115.37, 172.23 and 102.43

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Solution

The fourth proportional to 115.37, 172.23 and 102.43 is: 152.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.37 : 172.23 = 102.43 : x
  2. Step 2: Convert to fraction form
    115.37/172.23 = 102.43/x
  3. Step 3: Cross multiply
    115.37x = 172.23 × 102.43
  4. Step 4: Simplify right side
    115.37x = 17,641.35
  5. Step 5: Solve for x
    x = 17,641.35/115.37
  6. Step 6: Final answer
    x = 152.91

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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.