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Finding the Fourth Proportional to 212.47, 319.31 and 104.33

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Solution

The fourth proportional to 212.47, 319.31 and 104.33 is: 156.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.47 : 319.31 = 104.33 : x
  2. Step 2: Convert to fraction form
    212.47/319.31 = 104.33/x
  3. Step 3: Cross multiply
    212.47x = 319.31 × 104.33
  4. Step 4: Simplify right side
    212.47x = 33,314.28
  5. Step 5: Solve for x
    x = 33,314.28/212.47
  6. Step 6: Final answer
    x = 156.80

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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.