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Finding the Fourth Proportional to 192.51, 288.72 and 70.74

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Solution

The fourth proportional to 192.51, 288.72 and 70.74 is: 106.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.51 : 288.72 = 70.74 : x
  2. Step 2: Convert to fraction form
    192.51/288.72 = 70.74/x
  3. Step 3: Cross multiply
    192.51x = 288.72 × 70.74
  4. Step 4: Simplify right side
    192.51x = 20,424.05
  5. Step 5: Solve for x
    x = 20,424.05/192.51
  6. Step 6: Final answer
    x = 106.09

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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.