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Finding the Fourth Proportional to 172.76, 259.34 and 90.54

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Solution

The fourth proportional to 172.76, 259.34 and 90.54 is: 135.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.76 : 259.34 = 90.54 : x
  2. Step 2: Convert to fraction form
    172.76/259.34 = 90.54/x
  3. Step 3: Cross multiply
    172.76x = 259.34 × 90.54
  4. Step 4: Simplify right side
    172.76x = 23,480.19
  5. Step 5: Solve for x
    x = 23,480.19/172.76
  6. Step 6: Final answer
    x = 135.92

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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.