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Finding the Fourth Proportional to 692.12, 1,037.65 and 472.21

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Solution

The fourth proportional to 692.12, 1,037.65 and 472.21 is: 707.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.12 : 1,037.65 = 472.21 : x
  2. Step 2: Convert to fraction form
    692.12/1,037.65 = 472.21/x
  3. Step 3: Cross multiply
    692.12x = 1,037.65 × 472.21
  4. Step 4: Simplify right side
    692.12x = 489,984.93
  5. Step 5: Solve for x
    x = 489,984.93/692.12
  6. Step 6: Final answer
    x = 707.95

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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.