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Finding the Fourth Proportional to 807.77, 1,212.71 and 692.96

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Solution

The fourth proportional to 807.77, 1,212.71 and 692.96 is: 1,040.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.77 : 1,212.71 = 692.96 : x
  2. Step 2: Convert to fraction form
    807.77/1,212.71 = 692.96/x
  3. Step 3: Cross multiply
    807.77x = 1,212.71 × 692.96
  4. Step 4: Simplify right side
    807.77x = 840,349.99
  5. Step 5: Solve for x
    x = 840,349.99/807.77
  6. Step 6: Final answer
    x = 1,040.33

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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.