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Finding the Fourth Proportional to 1,960.60, 2,939.26 and 987.78

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Solution

The fourth proportional to 1,960.60, 2,939.26 and 987.78 is: 1,480.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.60 : 2,939.26 = 987.78 : x
  2. Step 2: Convert to fraction form
    1,960.60/2,939.26 = 987.78/x
  3. Step 3: Cross multiply
    1,960.60x = 2,939.26 × 987.78
  4. Step 4: Simplify right side
    1,960.60x = 2,903,342.24
  5. Step 5: Solve for x
    x = 2,903,342.24/1,960.60
  6. Step 6: Final answer
    x = 1,480.84

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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.