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Finding the Fourth Proportional to 1,355.36, 1,865.04 and 1,321.44

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Solution

The fourth proportional to 1,355.36, 1,865.04 and 1,321.44 is: 1,818.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.36 : 1,865.04 = 1,321.44 : x
  2. Step 2: Convert to fraction form
    1,355.36/1,865.04 = 1,321.44/x
  3. Step 3: Cross multiply
    1,355.36x = 1,865.04 × 1,321.44
  4. Step 4: Simplify right side
    1,355.36x = 2,464,538.46
  5. Step 5: Solve for x
    x = 2,464,538.46/1,355.36
  6. Step 6: Final answer
    x = 1,818.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.