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Finding the Fourth Proportional to 172.84, 259.44 and 76.72

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Solution

The fourth proportional to 172.84, 259.44 and 76.72 is: 115.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.84 : 259.44 = 76.72 : x
  2. Step 2: Convert to fraction form
    172.84/259.44 = 76.72/x
  3. Step 3: Cross multiply
    172.84x = 259.44 × 76.72
  4. Step 4: Simplify right side
    172.84x = 19,904.24
  5. Step 5: Solve for x
    x = 19,904.24/172.84
  6. Step 6: Final answer
    x = 115.16

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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.