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Finding the Fourth Proportional to 1,274.09, 1,911.54 and 543.71

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Solution

The fourth proportional to 1,274.09, 1,911.54 and 543.71 is: 815.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.09 : 1,911.54 = 543.71 : x
  2. Step 2: Convert to fraction form
    1,274.09/1,911.54 = 543.71/x
  3. Step 3: Cross multiply
    1,274.09x = 1,911.54 × 543.71
  4. Step 4: Simplify right side
    1,274.09x = 1,039,323.41
  5. Step 5: Solve for x
    x = 1,039,323.41/1,274.09
  6. Step 6: Final answer
    x = 815.74

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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.