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Finding the Fourth Proportional to 1,274.31, 1,911.46 and 349.79

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Solution

The fourth proportional to 1,274.31, 1,911.46 and 349.79 is: 524.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.31 : 1,911.46 = 349.79 : x
  2. Step 2: Convert to fraction form
    1,274.31/1,911.46 = 349.79/x
  3. Step 3: Cross multiply
    1,274.31x = 1,911.46 × 349.79
  4. Step 4: Simplify right side
    1,274.31x = 668,614.96
  5. Step 5: Solve for x
    x = 668,614.96/1,274.31
  6. Step 6: Final answer
    x = 524.69

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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.