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Finding the Fourth Proportional to 783.99, 1,081.83 and 489.15

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Solution

The fourth proportional to 783.99, 1,081.83 and 489.15 is: 674.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.99 : 1,081.83 = 489.15 : x
  2. Step 2: Convert to fraction form
    783.99/1,081.83 = 489.15/x
  3. Step 3: Cross multiply
    783.99x = 1,081.83 × 489.15
  4. Step 4: Simplify right side
    783.99x = 529,177.14
  5. Step 5: Solve for x
    x = 529,177.14/783.99
  6. Step 6: Final answer
    x = 674.98

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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.