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Finding the Fourth Proportional to 692.64, 1,038.72 and 259.92

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Solution

The fourth proportional to 692.64, 1,038.72 and 259.92 is: 389.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.64 : 1,038.72 = 259.92 : x
  2. Step 2: Convert to fraction form
    692.64/1,038.72 = 259.92/x
  3. Step 3: Cross multiply
    692.64x = 1,038.72 × 259.92
  4. Step 4: Simplify right side
    692.64x = 269,984.10
  5. Step 5: Solve for x
    x = 269,984.10/692.64
  6. Step 6: Final answer
    x = 389.79

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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.