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Finding the Fourth Proportional to 213.06, 319.65 and 91.33

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Solution

The fourth proportional to 213.06, 319.65 and 91.33 is: 137.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.06 : 319.65 = 91.33 : x
  2. Step 2: Convert to fraction form
    213.06/319.65 = 91.33/x
  3. Step 3: Cross multiply
    213.06x = 319.65 × 91.33
  4. Step 4: Simplify right side
    213.06x = 29,192.49
  5. Step 5: Solve for x
    x = 29,192.49/213.06
  6. Step 6: Final answer
    x = 137.01

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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.