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Finding the Fourth Proportional to 804.57, 1,109.80 and 489.61

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Solution

The fourth proportional to 804.57, 1,109.80 and 489.61 is: 675.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.57 : 1,109.80 = 489.61 : x
  2. Step 2: Convert to fraction form
    804.57/1,109.80 = 489.61/x
  3. Step 3: Cross multiply
    804.57x = 1,109.80 × 489.61
  4. Step 4: Simplify right side
    804.57x = 543,369.18
  5. Step 5: Solve for x
    x = 543,369.18/804.57
  6. Step 6: Final answer
    x = 675.35

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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.