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Finding the Fourth Proportional to 692.50, 952.86 and 668.56

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Solution

The fourth proportional to 692.50, 952.86 and 668.56 is: 919.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.50 : 952.86 = 668.56 : x
  2. Step 2: Convert to fraction form
    692.50/952.86 = 668.56/x
  3. Step 3: Cross multiply
    692.50x = 952.86 × 668.56
  4. Step 4: Simplify right side
    692.50x = 637,044.08
  5. Step 5: Solve for x
    x = 637,044.08/692.50
  6. Step 6: Final answer
    x = 919.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.