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Finding the Fourth Proportional to 1,274.39, 1,911.63 and 349.94

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Solution

The fourth proportional to 1,274.39, 1,911.63 and 349.94 is: 524.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.39 : 1,911.63 = 349.94 : x
  2. Step 2: Convert to fraction form
    1,274.39/1,911.63 = 349.94/x
  3. Step 3: Cross multiply
    1,274.39x = 1,911.63 × 349.94
  4. Step 4: Simplify right side
    1,274.39x = 668,960.58
  5. Step 5: Solve for x
    x = 668,960.58/1,274.39
  6. Step 6: Final answer
    x = 524.93

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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.