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Finding the Fourth Proportional to 374.31, 561.43 and 191.57

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Solution

The fourth proportional to 374.31, 561.43 and 191.57 is: 287.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.31 : 561.43 = 191.57 : x
  2. Step 2: Convert to fraction form
    374.31/561.43 = 191.57/x
  3. Step 3: Cross multiply
    374.31x = 561.43 × 191.57
  4. Step 4: Simplify right side
    374.31x = 107,553.15
  5. Step 5: Solve for x
    x = 107,553.15/374.31
  6. Step 6: Final answer
    x = 287.34

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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.