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Finding the Fourth Proportional to 172.76, 259.14 and 57.21

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Solution

The fourth proportional to 172.76, 259.14 and 57.21 is: 85.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.76 : 259.14 = 57.21 : x
  2. Step 2: Convert to fraction form
    172.76/259.14 = 57.21/x
  3. Step 3: Cross multiply
    172.76x = 259.14 × 57.21
  4. Step 4: Simplify right side
    172.76x = 14,825.40
  5. Step 5: Solve for x
    x = 14,825.40/172.76
  6. Step 6: Final answer
    x = 85.82

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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.