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Finding the Fourth Proportional to 692.64, 1,038.28 and 259.64

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Solution

The fourth proportional to 692.64, 1,038.28 and 259.64 is: 389.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.64 : 1,038.28 = 259.64 : x
  2. Step 2: Convert to fraction form
    692.64/1,038.28 = 259.64/x
  3. Step 3: Cross multiply
    692.64x = 1,038.28 × 259.64
  4. Step 4: Simplify right side
    692.64x = 269,579.02
  5. Step 5: Solve for x
    x = 269,579.02/692.64
  6. Step 6: Final answer
    x = 389.21

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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.