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Finding the Fourth Proportional to 692.76, 1,039.18 and 308.04

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Solution

The fourth proportional to 692.76, 1,039.18 and 308.04 is: 462.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.76 : 1,039.18 = 308.04 : x
  2. Step 2: Convert to fraction form
    692.76/1,039.18 = 308.04/x
  3. Step 3: Cross multiply
    692.76x = 1,039.18 × 308.04
  4. Step 4: Simplify right side
    692.76x = 320,109.01
  5. Step 5: Solve for x
    x = 320,109.01/692.76
  6. Step 6: Final answer
    x = 462.08

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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.