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Finding the Fourth Proportional to 1,292.94, 1,939.71 and 427.25

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Solution

The fourth proportional to 1,292.94, 1,939.71 and 427.25 is: 640.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.94 : 1,939.71 = 427.25 : x
  2. Step 2: Convert to fraction form
    1,292.94/1,939.71 = 427.25/x
  3. Step 3: Cross multiply
    1,292.94x = 1,939.71 × 427.25
  4. Step 4: Simplify right side
    1,292.94x = 828,741.10
  5. Step 5: Solve for x
    x = 828,741.10/1,292.94
  6. Step 6: Final answer
    x = 640.97

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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.