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Finding the Fourth Proportional to 1,294.88, 1,942.80 and 644.96

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Solution

The fourth proportional to 1,294.88, 1,942.80 and 644.96 is: 967.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.88 : 1,942.80 = 644.96 : x
  2. Step 2: Convert to fraction form
    1,294.88/1,942.80 = 644.96/x
  3. Step 3: Cross multiply
    1,294.88x = 1,942.80 × 644.96
  4. Step 4: Simplify right side
    1,294.88x = 1,253,028.29
  5. Step 5: Solve for x
    x = 1,253,028.29/1,294.88
  6. Step 6: Final answer
    x = 967.68

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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.