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Finding the Fourth Proportional to 114.86, 172.05 and 86

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Solution

The fourth proportional to 114.86, 172.05 and 86 is: 128.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.86 : 172.05 = 86 : x
  2. Step 2: Convert to fraction form
    114.86/172.05 = 86/x
  3. Step 3: Cross multiply
    114.86x = 172.05 × 86
  4. Step 4: Simplify right side
    114.86x = 14,796.30
  5. Step 5: Solve for x
    x = 14,796.30/114.86
  6. Step 6: Final answer
    x = 128.82

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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.