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Finding the Fourth Proportional to 188.39, 282.53 and 72.81

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Solution

The fourth proportional to 188.39, 282.53 and 72.81 is: 109.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.39 : 282.53 = 72.81 : x
  2. Step 2: Convert to fraction form
    188.39/282.53 = 72.81/x
  3. Step 3: Cross multiply
    188.39x = 282.53 × 72.81
  4. Step 4: Simplify right side
    188.39x = 20,571.19
  5. Step 5: Solve for x
    x = 20,571.19/188.39
  6. Step 6: Final answer
    x = 109.19

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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.