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Finding the Fourth Proportional to 1,183.20, 1,774.80 and 656.70

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Solution

The fourth proportional to 1,183.20, 1,774.80 and 656.70 is: 985.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,183.20 : 1,774.80 = 656.70 : x
  2. Step 2: Convert to fraction form
    1,183.20/1,774.80 = 656.70/x
  3. Step 3: Cross multiply
    1,183.20x = 1,774.80 × 656.70
  4. Step 4: Simplify right side
    1,183.20x = 1,165,511.16
  5. Step 5: Solve for x
    x = 1,165,511.16/1,183.20
  6. Step 6: Final answer
    x = 985.05

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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.