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Finding the Fourth Proportional to 1,274.92, 1,759.43 and 777.21

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Solution

The fourth proportional to 1,274.92, 1,759.43 and 777.21 is: 1,072.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.92 : 1,759.43 = 777.21 : x
  2. Step 2: Convert to fraction form
    1,274.92/1,759.43 = 777.21/x
  3. Step 3: Cross multiply
    1,274.92x = 1,759.43 × 777.21
  4. Step 4: Simplify right side
    1,274.92x = 1,367,441.94
  5. Step 5: Solve for x
    x = 1,367,441.94/1,274.92
  6. Step 6: Final answer
    x = 1,072.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.