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Finding the Fourth Proportional to 804.38, 1,109.88 and 489.82

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Solution

The fourth proportional to 804.38, 1,109.88 and 489.82 is: 675.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.38 : 1,109.88 = 489.82 : x
  2. Step 2: Convert to fraction form
    804.38/1,109.88 = 489.82/x
  3. Step 3: Cross multiply
    804.38x = 1,109.88 × 489.82
  4. Step 4: Simplify right side
    804.38x = 543,641.42
  5. Step 5: Solve for x
    x = 543,641.42/804.38
  6. Step 6: Final answer
    x = 675.85

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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.