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Finding the Fourth Proportional to 1,293.42, 1,940.16 and 427.80

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Solution

The fourth proportional to 1,293.42, 1,940.16 and 427.80 is: 641.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.42 : 1,940.16 = 427.80 : x
  2. Step 2: Convert to fraction form
    1,293.42/1,940.16 = 427.80/x
  3. Step 3: Cross multiply
    1,293.42x = 1,940.16 × 427.80
  4. Step 4: Simplify right side
    1,293.42x = 830,000.45
  5. Step 5: Solve for x
    x = 830,000.45/1,293.42
  6. Step 6: Final answer
    x = 641.71

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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.