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Finding the Fourth Proportional to 1,277.70, 1,917.77 and 692.97

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Solution

The fourth proportional to 1,277.70, 1,917.77 and 692.97 is: 1,040.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.70 : 1,917.77 = 692.97 : x
  2. Step 2: Convert to fraction form
    1,277.70/1,917.77 = 692.97/x
  3. Step 3: Cross multiply
    1,277.70x = 1,917.77 × 692.97
  4. Step 4: Simplify right side
    1,277.70x = 1,328,953.61
  5. Step 5: Solve for x
    x = 1,328,953.61/1,277.70
  6. Step 6: Final answer
    x = 1,040.11

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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.