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Finding the Fourth Proportional to 692.90, 1,039.45 and 230.60

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Solution

The fourth proportional to 692.90, 1,039.45 and 230.60 is: 345.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.90 : 1,039.45 = 230.60 : x
  2. Step 2: Convert to fraction form
    692.90/1,039.45 = 230.60/x
  3. Step 3: Cross multiply
    692.90x = 1,039.45 × 230.60
  4. Step 4: Simplify right side
    692.90x = 239,697.17
  5. Step 5: Solve for x
    x = 239,697.17/692.90
  6. Step 6: Final answer
    x = 345.93

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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.