Home / 393,899.28-543,395.16-286,422

Finding the Fourth Proportional to 393,899.28, 543,395.16 and 286,422

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Solution

The fourth proportional to 393,899.28, 543,395.16 and 286,422 is: 395,127.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,899.28 : 543,395.16 = 286,422 : x
  2. Step 2: Convert to fraction form
    393,899.28/543,395.16 = 286,422/x
  3. Step 3: Cross multiply
    393,899.28x = 543,395.16 × 286,422
  4. Step 4: Simplify right side
    393,899.28x = 155,640,328,517.52
  5. Step 5: Solve for x
    x = 155,640,328,517.52/393,899.28
  6. Step 6: Final answer
    x = 395,127.22

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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.