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Finding the Fourth Proportional to 692.75, 1,040.63 and 419.00

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Solution

The fourth proportional to 692.75, 1,040.63 and 419.00 is: 629.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.75 : 1,040.63 = 419.00 : x
  2. Step 2: Convert to fraction form
    692.75/1,040.63 = 419.00/x
  3. Step 3: Cross multiply
    692.75x = 1,040.63 × 419.00
  4. Step 4: Simplify right side
    692.75x = 436,016.67
  5. Step 5: Solve for x
    x = 436,016.67/692.75
  6. Step 6: Final answer
    x = 629.40

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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.