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Finding the Fourth Proportional to 692.45, 1,040.70 and 603.35

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Solution

The fourth proportional to 692.45, 1,040.70 and 603.35 is: 906.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.45 : 1,040.70 = 603.35 : x
  2. Step 2: Convert to fraction form
    692.45/1,040.70 = 603.35/x
  3. Step 3: Cross multiply
    692.45x = 1,040.70 × 603.35
  4. Step 4: Simplify right side
    692.45x = 627,906.35
  5. Step 5: Solve for x
    x = 627,906.35/692.45
  6. Step 6: Final answer
    x = 906.79

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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.