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Finding the Fourth Proportional to 115.37, 172.87 and 86.34

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Solution

The fourth proportional to 115.37, 172.87 and 86.34 is: 129.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.37 : 172.87 = 86.34 : x
  2. Step 2: Convert to fraction form
    115.37/172.87 = 86.34/x
  3. Step 3: Cross multiply
    115.37x = 172.87 × 86.34
  4. Step 4: Simplify right side
    115.37x = 14,925.60
  5. Step 5: Solve for x
    x = 14,925.60/115.37
  6. Step 6: Final answer
    x = 129.37

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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.