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Finding the Fourth Proportional to 1,960.19, 2,939.98 and 643.93

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Solution

The fourth proportional to 1,960.19, 2,939.98 and 643.93 is: 965.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.19 : 2,939.98 = 643.93 : x
  2. Step 2: Convert to fraction form
    1,960.19/2,939.98 = 643.93/x
  3. Step 3: Cross multiply
    1,960.19x = 2,939.98 × 643.93
  4. Step 4: Simplify right side
    1,960.19x = 1,893,141.32
  5. Step 5: Solve for x
    x = 1,893,141.32/1,960.19
  6. Step 6: Final answer
    x = 965.79

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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.