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Finding the Fourth Proportional to 692.12, 1,038.90 and 448.04

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Solution

The fourth proportional to 692.12, 1,038.90 and 448.04 is: 672.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.12 : 1,038.90 = 448.04 : x
  2. Step 2: Convert to fraction form
    692.12/1,038.90 = 448.04/x
  3. Step 3: Cross multiply
    692.12x = 1,038.90 × 448.04
  4. Step 4: Simplify right side
    692.12x = 465,468.76
  5. Step 5: Solve for x
    x = 465,468.76/692.12
  6. Step 6: Final answer
    x = 672.53

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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.