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Finding the Fourth Proportional to 1,305.49, 1,956.20 and 719.99

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Solution

The fourth proportional to 1,305.49, 1,956.20 and 719.99 is: 1,078.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.49 : 1,956.20 = 719.99 : x
  2. Step 2: Convert to fraction form
    1,305.49/1,956.20 = 719.99/x
  3. Step 3: Cross multiply
    1,305.49x = 1,956.20 × 719.99
  4. Step 4: Simplify right side
    1,305.49x = 1,408,444.44
  5. Step 5: Solve for x
    x = 1,408,444.44/1,305.49
  6. Step 6: Final answer
    x = 1,078.86

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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.