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Finding the Fourth Proportional to 394,639.74, 543,858.80 and 285,559.47

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Solution

The fourth proportional to 394,639.74, 543,858.80 and 285,559.47 is: 393,533.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,639.74 : 543,858.80 = 285,559.47 : x
  2. Step 2: Convert to fraction form
    394,639.74/543,858.80 = 285,559.47/x
  3. Step 3: Cross multiply
    394,639.74x = 543,858.80 × 285,559.47
  4. Step 4: Simplify right side
    394,639.74x = 155,304,029,255.04
  5. Step 5: Solve for x
    x = 155,304,029,255.04/394,639.74
  6. Step 6: Final answer
    x = 393,533.68

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1.5x scale

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.