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Finding the Fourth Proportional to 1,959.48, 2,938.89 and 643.21

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Solution

The fourth proportional to 1,959.48, 2,938.89 and 643.21 is: 964.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.48 : 2,938.89 = 643.21 : x
  2. Step 2: Convert to fraction form
    1,959.48/2,938.89 = 643.21/x
  3. Step 3: Cross multiply
    1,959.48x = 2,938.89 × 643.21
  4. Step 4: Simplify right side
    1,959.48x = 1,890,323.44
  5. Step 5: Solve for x
    x = 1,890,323.44/1,959.48
  6. Step 6: Final answer
    x = 964.71

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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.