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Finding the Fourth Proportional to 692.27, 1,038.57 and 345.75

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Solution

The fourth proportional to 692.27, 1,038.57 and 345.75 is: 518.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.27 : 1,038.57 = 345.75 : x
  2. Step 2: Convert to fraction form
    692.27/1,038.57 = 345.75/x
  3. Step 3: Cross multiply
    692.27x = 1,038.57 × 345.75
  4. Step 4: Simplify right side
    692.27x = 359,085.58
  5. Step 5: Solve for x
    x = 359,085.58/692.27
  6. Step 6: Final answer
    x = 518.71

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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.