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Finding the Fourth Proportional to 192.30, 287.90 and 137.76

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Solution

The fourth proportional to 192.30, 287.90 and 137.76 is: 206.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.30 : 287.90 = 137.76 : x
  2. Step 2: Convert to fraction form
    192.30/287.90 = 137.76/x
  3. Step 3: Cross multiply
    192.30x = 287.90 × 137.76
  4. Step 4: Simplify right side
    192.30x = 39,661.10
  5. Step 5: Solve for x
    x = 39,661.10/192.30
  6. Step 6: Final answer
    x = 206.25

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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.