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Finding the Fourth Proportional to 1,274.52, 1,911.98 and 408.64

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Solution

The fourth proportional to 1,274.52, 1,911.98 and 408.64 is: 613.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.52 : 1,911.98 = 408.64 : x
  2. Step 2: Convert to fraction form
    1,274.52/1,911.98 = 408.64/x
  3. Step 3: Cross multiply
    1,274.52x = 1,911.98 × 408.64
  4. Step 4: Simplify right side
    1,274.52x = 781,311.51
  5. Step 5: Solve for x
    x = 781,311.51/1,274.52
  6. Step 6: Final answer
    x = 613.02

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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.