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Finding the Fourth Proportional to 1,967.66, 2,947.60 and 1,187.86

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Solution

The fourth proportional to 1,967.66, 2,947.60 and 1,187.86 is: 1,779.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,967.66 : 2,947.60 = 1,187.86 : x
  2. Step 2: Convert to fraction form
    1,967.66/2,947.60 = 1,187.86/x
  3. Step 3: Cross multiply
    1,967.66x = 2,947.60 × 1,187.86
  4. Step 4: Simplify right side
    1,967.66x = 3,501,336.14
  5. Step 5: Solve for x
    x = 3,501,336.14/1,967.66
  6. Step 6: Final answer
    x = 1,779.44

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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.