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Finding the Fourth Proportional to 115.30, 172.51 and 89.43

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Solution

The fourth proportional to 115.30, 172.51 and 89.43 is: 133.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.30 : 172.51 = 89.43 : x
  2. Step 2: Convert to fraction form
    115.30/172.51 = 89.43/x
  3. Step 3: Cross multiply
    115.30x = 172.51 × 89.43
  4. Step 4: Simplify right side
    115.30x = 15,427.20
  5. Step 5: Solve for x
    x = 15,427.20/115.30
  6. Step 6: Final answer
    x = 133.80

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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.