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Finding the Fourth Proportional to 192.84, 287.76 and 172.40

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Solution

The fourth proportional to 192.84, 287.76 and 172.40 is: 257.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.84 : 287.76 = 172.40 : x
  2. Step 2: Convert to fraction form
    192.84/287.76 = 172.40/x
  3. Step 3: Cross multiply
    192.84x = 287.76 × 172.40
  4. Step 4: Simplify right side
    192.84x = 49,608.39
  5. Step 5: Solve for x
    x = 49,608.39/192.84
  6. Step 6: Final answer
    x = 257.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.