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Finding the Fourth Proportional to 1,321.68, 1,965.87 and 1,317.24

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Solution

The fourth proportional to 1,321.68, 1,965.87 and 1,317.24 is: 1,959.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.68 : 1,965.87 = 1,317.24 : x
  2. Step 2: Convert to fraction form
    1,321.68/1,965.87 = 1,317.24/x
  3. Step 3: Cross multiply
    1,321.68x = 1,965.87 × 1,317.24
  4. Step 4: Simplify right side
    1,321.68x = 2,589,522.60
  5. Step 5: Solve for x
    x = 2,589,522.60/1,321.68
  6. Step 6: Final answer
    x = 1,959.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.