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Finding the Fourth Proportional to 828,287.40, 1,242,431.10 and 678,696.60

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Solution

The fourth proportional to 828,287.40, 1,242,431.10 and 678,696.60 is: 1,018,044.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    828,287.40 : 1,242,431.10 = 678,696.60 : x
  2. Step 2: Convert to fraction form
    828,287.40/1,242,431.10 = 678,696.60/x
  3. Step 3: Cross multiply
    828,287.40x = 1,242,431.10 × 678,696.60
  4. Step 4: Simplify right side
    828,287.40x = 843,233,763,304.26
  5. Step 5: Solve for x
    x = 843,233,763,304.26/828,287.40
  6. Step 6: Final answer
    x = 1,018,044.90

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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.