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Finding the Fourth Proportional to 828.90, 1,243.02 and 418.28

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Solution

The fourth proportional to 828.90, 1,243.02 and 418.28 is: 627.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.90 : 1,243.02 = 418.28 : x
  2. Step 2: Convert to fraction form
    828.90/1,243.02 = 418.28/x
  3. Step 3: Cross multiply
    828.90x = 1,243.02 × 418.28
  4. Step 4: Simplify right side
    828.90x = 519,930.41
  5. Step 5: Solve for x
    x = 519,930.41/828.90
  6. Step 6: Final answer
    x = 627.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.