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Finding the Fourth Proportional to 115.03, 172.65 and 81.01

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Solution

The fourth proportional to 115.03, 172.65 and 81.01 is: 121.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.03 : 172.65 = 81.01 : x
  2. Step 2: Convert to fraction form
    115.03/172.65 = 81.01/x
  3. Step 3: Cross multiply
    115.03x = 172.65 × 81.01
  4. Step 4: Simplify right side
    115.03x = 13,986.38
  5. Step 5: Solve for x
    x = 13,986.38/115.03
  6. Step 6: Final answer
    x = 121.59

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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.