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Finding the Fourth Proportional to 1,960.71, 2,940.75 and 644.07

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Solution

The fourth proportional to 1,960.71, 2,940.75 and 644.07 is: 966.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.71 : 2,940.75 = 644.07 : x
  2. Step 2: Convert to fraction form
    1,960.71/2,940.75 = 644.07/x
  3. Step 3: Cross multiply
    1,960.71x = 2,940.75 × 644.07
  4. Step 4: Simplify right side
    1,960.71x = 1,894,048.85
  5. Step 5: Solve for x
    x = 1,894,048.85/1,960.71
  6. Step 6: Final answer
    x = 966.00

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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.