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Finding the Fourth Proportional to 843.78, 1,164.28 and 489.75

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Solution

The fourth proportional to 843.78, 1,164.28 and 489.75 is: 675.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.78 : 1,164.28 = 489.75 : x
  2. Step 2: Convert to fraction form
    843.78/1,164.28 = 489.75/x
  3. Step 3: Cross multiply
    843.78x = 1,164.28 × 489.75
  4. Step 4: Simplify right side
    843.78x = 570,206.13
  5. Step 5: Solve for x
    x = 570,206.13/843.78
  6. Step 6: Final answer
    x = 675.78

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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.