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Finding the Fourth Proportional to 1,305.74, 1,956.78 and 980.90

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Solution

The fourth proportional to 1,305.74, 1,956.78 and 980.90 is: 1,469.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.74 : 1,956.78 = 980.90 : x
  2. Step 2: Convert to fraction form
    1,305.74/1,956.78 = 980.90/x
  3. Step 3: Cross multiply
    1,305.74x = 1,956.78 × 980.90
  4. Step 4: Simplify right side
    1,305.74x = 1,919,405.50
  5. Step 5: Solve for x
    x = 1,919,405.50/1,305.74
  6. Step 6: Final answer
    x = 1,469.98

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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.