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Finding the Fourth Proportional to 188.55, 282.66 and 90.99

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Solution

The fourth proportional to 188.55, 282.66 and 90.99 is: 136.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.55 : 282.66 = 90.99 : x
  2. Step 2: Convert to fraction form
    188.55/282.66 = 90.99/x
  3. Step 3: Cross multiply
    188.55x = 282.66 × 90.99
  4. Step 4: Simplify right side
    188.55x = 25,719.23
  5. Step 5: Solve for x
    x = 25,719.23/188.55
  6. Step 6: Final answer
    x = 136.41

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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.