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Finding the Fourth Proportional to 115.34, 172.86 and 84.96

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Solution

The fourth proportional to 115.34, 172.86 and 84.96 is: 127.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.34 : 172.86 = 84.96 : x
  2. Step 2: Convert to fraction form
    115.34/172.86 = 84.96/x
  3. Step 3: Cross multiply
    115.34x = 172.86 × 84.96
  4. Step 4: Simplify right side
    115.34x = 14,686.19
  5. Step 5: Solve for x
    x = 14,686.19/115.34
  6. Step 6: Final answer
    x = 127.33

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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.