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Finding the Fourth Proportional to 1,271.98, 1,755.45 and 774.74

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Solution

The fourth proportional to 1,271.98, 1,755.45 and 774.74 is: 1,069.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.98 : 1,755.45 = 774.74 : x
  2. Step 2: Convert to fraction form
    1,271.98/1,755.45 = 774.74/x
  3. Step 3: Cross multiply
    1,271.98x = 1,755.45 × 774.74
  4. Step 4: Simplify right side
    1,271.98x = 1,360,017.33
  5. Step 5: Solve for x
    x = 1,360,017.33/1,271.98
  6. Step 6: Final answer
    x = 1,069.21

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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.