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Finding the Fourth Proportional to 1,305.60, 1,956.62 and 656.78

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Solution

The fourth proportional to 1,305.60, 1,956.62 and 656.78 is: 984.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.60 : 1,956.62 = 656.78 : x
  2. Step 2: Convert to fraction form
    1,305.60/1,956.62 = 656.78/x
  3. Step 3: Cross multiply
    1,305.60x = 1,956.62 × 656.78
  4. Step 4: Simplify right side
    1,305.60x = 1,285,068.88
  5. Step 5: Solve for x
    x = 1,285,068.88/1,305.60
  6. Step 6: Final answer
    x = 984.27

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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.