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Finding the Fourth Proportional to 172.93, 259.21 and 87.25

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Solution

The fourth proportional to 172.93, 259.21 and 87.25 is: 130.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.93 : 259.21 = 87.25 : x
  2. Step 2: Convert to fraction form
    172.93/259.21 = 87.25/x
  3. Step 3: Cross multiply
    172.93x = 259.21 × 87.25
  4. Step 4: Simplify right side
    172.93x = 22,616.07
  5. Step 5: Solve for x
    x = 22,616.07/172.93
  6. Step 6: Final answer
    x = 130.78

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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.