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Finding the Fourth Proportional to 692.60, 1,038.87 and 259.74

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Solution

The fourth proportional to 692.60, 1,038.87 and 259.74 is: 389.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.60 : 1,038.87 = 259.74 : x
  2. Step 2: Convert to fraction form
    692.60/1,038.87 = 259.74/x
  3. Step 3: Cross multiply
    692.60x = 1,038.87 × 259.74
  4. Step 4: Simplify right side
    692.60x = 269,836.09
  5. Step 5: Solve for x
    x = 269,836.09/692.60
  6. Step 6: Final answer
    x = 389.60

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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.