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Finding the Fourth Proportional to 692.24, 1,038.68 and 281.66

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Solution

The fourth proportional to 692.24, 1,038.68 and 281.66 is: 422.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.24 : 1,038.68 = 281.66 : x
  2. Step 2: Convert to fraction form
    692.24/1,038.68 = 281.66/x
  3. Step 3: Cross multiply
    692.24x = 1,038.68 × 281.66
  4. Step 4: Simplify right side
    692.24x = 292,554.61
  5. Step 5: Solve for x
    x = 292,554.61/692.24
  6. Step 6: Final answer
    x = 422.62

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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.