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Finding the Fourth Proportional to 692.50, 1,039.20 and 307.75

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Solution

The fourth proportional to 692.50, 1,039.20 and 307.75 is: 461.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.50 : 1,039.20 = 307.75 : x
  2. Step 2: Convert to fraction form
    692.50/1,039.20 = 307.75/x
  3. Step 3: Cross multiply
    692.50x = 1,039.20 × 307.75
  4. Step 4: Simplify right side
    692.50x = 319,813.80
  5. Step 5: Solve for x
    x = 319,813.80/692.50
  6. Step 6: Final answer
    x = 461.82

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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.