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Finding the Fourth Proportional to 188.80, 282.08 and 140.80

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Solution

The fourth proportional to 188.80, 282.08 and 140.80 is: 210.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.80 : 282.08 = 140.80 : x
  2. Step 2: Convert to fraction form
    188.80/282.08 = 140.80/x
  3. Step 3: Cross multiply
    188.80x = 282.08 × 140.80
  4. Step 4: Simplify right side
    188.80x = 39,716.86
  5. Step 5: Solve for x
    x = 39,716.86/188.80
  6. Step 6: Final answer
    x = 210.36

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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.