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Finding the Fourth Proportional to 738,361.72, 1,018,939.62 and 398,830

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Solution

The fourth proportional to 738,361.72, 1,018,939.62 and 398,830 is: 550,385.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    738,361.72 : 1,018,939.62 = 398,830 : x
  2. Step 2: Convert to fraction form
    738,361.72/1,018,939.62 = 398,830/x
  3. Step 3: Cross multiply
    738,361.72x = 1,018,939.62 × 398,830
  4. Step 4: Simplify right side
    738,361.72x = 406,383,688,644.60
  5. Step 5: Solve for x
    x = 406,383,688,644.60/738,361.72
  6. Step 6: Final answer
    x = 550,385.64

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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.