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Finding the Fourth Proportional to 188.51, 282.78 and 72.99

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Solution

The fourth proportional to 188.51, 282.78 and 72.99 is: 109.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.51 : 282.78 = 72.99 : x
  2. Step 2: Convert to fraction form
    188.51/282.78 = 72.99/x
  3. Step 3: Cross multiply
    188.51x = 282.78 × 72.99
  4. Step 4: Simplify right side
    188.51x = 20,640.11
  5. Step 5: Solve for x
    x = 20,640.11/188.51
  6. Step 6: Final answer
    x = 109.49

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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.