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Finding the Fourth Proportional to 1,939.40, 2,905.90 and 1,651.40

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Solution

The fourth proportional to 1,939.40, 2,905.90 and 1,651.40 is: 2,474.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.40 : 2,905.90 = 1,651.40 : x
  2. Step 2: Convert to fraction form
    1,939.40/2,905.90 = 1,651.40/x
  3. Step 3: Cross multiply
    1,939.40x = 2,905.90 × 1,651.40
  4. Step 4: Simplify right side
    1,939.40x = 4,798,803.26
  5. Step 5: Solve for x
    x = 4,798,803.26/1,939.40
  6. Step 6: Final answer
    x = 2,474.38

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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.