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Finding the Fourth Proportional to 1,305.44, 1,965.98 and 1,188.80

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Solution

The fourth proportional to 1,305.44, 1,965.98 and 1,188.80 is: 1,790.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.44 : 1,965.98 = 1,188.80 : x
  2. Step 2: Convert to fraction form
    1,305.44/1,965.98 = 1,188.80/x
  3. Step 3: Cross multiply
    1,305.44x = 1,965.98 × 1,188.80
  4. Step 4: Simplify right side
    1,305.44x = 2,337,157.02
  5. Step 5: Solve for x
    x = 2,337,157.02/1,305.44
  6. Step 6: Final answer
    x = 1,790.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.