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Finding the Fourth Proportional to 1,294.24, 1,940.55 and 860.89

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Solution

The fourth proportional to 1,294.24, 1,940.55 and 860.89 is: 1,290.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.24 : 1,940.55 = 860.89 : x
  2. Step 2: Convert to fraction form
    1,294.24/1,940.55 = 860.89/x
  3. Step 3: Cross multiply
    1,294.24x = 1,940.55 × 860.89
  4. Step 4: Simplify right side
    1,294.24x = 1,670,600.09
  5. Step 5: Solve for x
    x = 1,670,600.09/1,294.24
  6. Step 6: Final answer
    x = 1,290.80

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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.