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Finding the Fourth Proportional to 1,274.60, 1,911.71 and 408.80

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Solution

The fourth proportional to 1,274.60, 1,911.71 and 408.80 is: 613.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.60 : 1,911.71 = 408.80 : x
  2. Step 2: Convert to fraction form
    1,274.60/1,911.71 = 408.80/x
  3. Step 3: Cross multiply
    1,274.60x = 1,911.71 × 408.80
  4. Step 4: Simplify right side
    1,274.60x = 781,498.51
  5. Step 5: Solve for x
    x = 781,498.51/1,274.60
  6. Step 6: Final answer
    x = 613.13

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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.