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Finding the Fourth Proportional to 114.89, 172.09 and 71.58

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Solution

The fourth proportional to 114.89, 172.09 and 71.58 is: 107.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.89 : 172.09 = 71.58 : x
  2. Step 2: Convert to fraction form
    114.89/172.09 = 71.58/x
  3. Step 3: Cross multiply
    114.89x = 172.09 × 71.58
  4. Step 4: Simplify right side
    114.89x = 12,317.65
  5. Step 5: Solve for x
    x = 12,317.65/114.89
  6. Step 6: Final answer
    x = 107.21

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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.