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Finding the Fourth Proportional to 393,915.36, 543,854.59 and 321,491.26

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Solution

The fourth proportional to 393,915.36, 543,854.59 and 321,491.26 is: 443,863.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,915.36 : 543,854.59 = 321,491.26 : x
  2. Step 2: Convert to fraction form
    393,915.36/543,854.59 = 321,491.26/x
  3. Step 3: Cross multiply
    393,915.36x = 543,854.59 × 321,491.26
  4. Step 4: Simplify right side
    393,915.36x = 174,844,494,676.61
  5. Step 5: Solve for x
    x = 174,844,494,676.61/393,915.36
  6. Step 6: Final answer
    x = 443,863.10

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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.