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Finding the Fourth Proportional to 1,940.38, 2,910.93 and 642.76

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Solution

The fourth proportional to 1,940.38, 2,910.93 and 642.76 is: 964.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.38 : 2,910.93 = 642.76 : x
  2. Step 2: Convert to fraction form
    1,940.38/2,910.93 = 642.76/x
  3. Step 3: Cross multiply
    1,940.38x = 2,910.93 × 642.76
  4. Step 4: Simplify right side
    1,940.38x = 1,871,029.37
  5. Step 5: Solve for x
    x = 1,871,029.37/1,940.38
  6. Step 6: Final answer
    x = 964.26

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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.