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Finding the Fourth Proportional to 692.15, 1,036.80 and 447.93

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Solution

The fourth proportional to 692.15, 1,036.80 and 447.93 is: 670.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.15 : 1,036.80 = 447.93 : x
  2. Step 2: Convert to fraction form
    692.15/1,036.80 = 447.93/x
  3. Step 3: Cross multiply
    692.15x = 1,036.80 × 447.93
  4. Step 4: Simplify right side
    692.15x = 464,413.82
  5. Step 5: Solve for x
    x = 464,413.82/692.15
  6. Step 6: Final answer
    x = 670.98

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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.