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Finding the Fourth Proportional to 114.89, 172.39 and 74.30

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Solution

The fourth proportional to 114.89, 172.39 and 74.30 is: 111.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.89 : 172.39 = 74.30 : x
  2. Step 2: Convert to fraction form
    114.89/172.39 = 74.30/x
  3. Step 3: Cross multiply
    114.89x = 172.39 × 74.30
  4. Step 4: Simplify right side
    114.89x = 12,808.21
  5. Step 5: Solve for x
    x = 12,808.21/114.89
  6. Step 6: Final answer
    x = 111.48

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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.