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Finding the Fourth Proportional to 692.74, 1,038.84 and 259.76

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Solution

The fourth proportional to 692.74, 1,038.84 and 259.76 is: 389.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.74 : 1,038.84 = 259.76 : x
  2. Step 2: Convert to fraction form
    692.74/1,038.84 = 259.76/x
  3. Step 3: Cross multiply
    692.74x = 1,038.84 × 259.76
  4. Step 4: Simplify right side
    692.74x = 269,849.08
  5. Step 5: Solve for x
    x = 269,849.08/692.74
  6. Step 6: Final answer
    x = 389.54

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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.