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Finding the Fourth Proportional to 213.75, 319.01 and 187.79

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Solution

The fourth proportional to 213.75, 319.01 and 187.79 is: 280.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.75 : 319.01 = 187.79 : x
  2. Step 2: Convert to fraction form
    213.75/319.01 = 187.79/x
  3. Step 3: Cross multiply
    213.75x = 319.01 × 187.79
  4. Step 4: Simplify right side
    213.75x = 59,904.35
  5. Step 5: Solve for x
    x = 59,904.35/213.75
  6. Step 6: Final answer
    x = 280.25

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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.