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Finding the Fourth Proportional to 780,356.78, 1,076,979.78 and 440,846.90

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Solution

The fourth proportional to 780,356.78, 1,076,979.78 and 440,846.90 is: 608,418.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,356.78 : 1,076,979.78 = 440,846.90 : x
  2. Step 2: Convert to fraction form
    780,356.78/1,076,979.78 = 440,846.90/x
  3. Step 3: Cross multiply
    780,356.78x = 1,076,979.78 × 440,846.90
  4. Step 4: Simplify right side
    780,356.78x = 474,783,197,375.68
  5. Step 5: Solve for x
    x = 474,783,197,375.68/780,356.78
  6. Step 6: Final answer
    x = 608,418.11

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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.