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Finding the Fourth Proportional to 804.39, 1,109.77 and 489.55

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Solution

The fourth proportional to 804.39, 1,109.77 and 489.55 is: 675.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.39 : 1,109.77 = 489.55 : x
  2. Step 2: Convert to fraction form
    804.39/1,109.77 = 489.55/x
  3. Step 3: Cross multiply
    804.39x = 1,109.77 × 489.55
  4. Step 4: Simplify right side
    804.39x = 543,285.46
  5. Step 5: Solve for x
    x = 543,285.46/804.39
  6. Step 6: Final answer
    x = 675.40

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1.5x scale

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.