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Finding the Fourth Proportional to 692.30, 1,038.31 and 205.22

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Solution

The fourth proportional to 692.30, 1,038.31 and 205.22 is: 307.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.30 : 1,038.31 = 205.22 : x
  2. Step 2: Convert to fraction form
    692.30/1,038.31 = 205.22/x
  3. Step 3: Cross multiply
    692.30x = 1,038.31 × 205.22
  4. Step 4: Simplify right side
    692.30x = 213,084.06
  5. Step 5: Solve for x
    x = 213,084.06/692.30
  6. Step 6: Final answer
    x = 307.79

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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.