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Finding the Fourth Proportional to 187.14, 280.31 and 90.75

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Solution

The fourth proportional to 187.14, 280.31 and 90.75 is: 135.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.14 : 280.31 = 90.75 : x
  2. Step 2: Convert to fraction form
    187.14/280.31 = 90.75/x
  3. Step 3: Cross multiply
    187.14x = 280.31 × 90.75
  4. Step 4: Simplify right side
    187.14x = 25,437.68
  5. Step 5: Solve for x
    x = 25,437.68/187.14
  6. Step 6: Final answer
    x = 135.93

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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.