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Finding the Fourth Proportional to 1,294.89, 1,940.45 and 644.73

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Solution

The fourth proportional to 1,294.89, 1,940.45 and 644.73 is: 966.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.89 : 1,940.45 = 644.73 : x
  2. Step 2: Convert to fraction form
    1,294.89/1,940.45 = 644.73/x
  3. Step 3: Cross multiply
    1,294.89x = 1,940.45 × 644.73
  4. Step 4: Simplify right side
    1,294.89x = 1,251,063.10
  5. Step 5: Solve for x
    x = 1,251,063.10/1,294.89
  6. Step 6: Final answer
    x = 966.15

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1.5x scale

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.