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Finding the Fourth Proportional to 393,915.11, 543,854.25 and 321,491.01

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Solution

The fourth proportional to 393,915.11, 543,854.25 and 321,491.01 is: 443,862.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,915.11 : 543,854.25 = 321,491.01 : x
  2. Step 2: Convert to fraction form
    393,915.11/543,854.25 = 321,491.01/x
  3. Step 3: Cross multiply
    393,915.11x = 543,854.25 × 321,491.01
  4. Step 4: Simplify right side
    393,915.11x = 174,844,248,602.29
  5. Step 5: Solve for x
    x = 174,844,248,602.29/393,915.11
  6. Step 6: Final answer
    x = 443,862.76

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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.