Home / 1,056.90-1,584.39-408.12

Finding the Fourth Proportional to 1,056.90, 1,584.39 and 408.12

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Solution

The fourth proportional to 1,056.90, 1,584.39 and 408.12 is: 611.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,056.90 : 1,584.39 = 408.12 : x
  2. Step 2: Convert to fraction form
    1,056.90/1,584.39 = 408.12/x
  3. Step 3: Cross multiply
    1,056.90x = 1,584.39 × 408.12
  4. Step 4: Simplify right side
    1,056.90x = 646,621.25
  5. Step 5: Solve for x
    x = 646,621.25/1,056.90
  6. Step 6: Final answer
    x = 611.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.