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Finding the Fourth Proportional to 1,386.36, 2,078.44 and 893.08

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Solution

The fourth proportional to 1,386.36, 2,078.44 and 893.08 is: 1,338.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.36 : 2,078.44 = 893.08 : x
  2. Step 2: Convert to fraction form
    1,386.36/2,078.44 = 893.08/x
  3. Step 3: Cross multiply
    1,386.36x = 2,078.44 × 893.08
  4. Step 4: Simplify right side
    1,386.36x = 1,856,213.20
  5. Step 5: Solve for x
    x = 1,856,213.20/1,386.36
  6. Step 6: Final answer
    x = 1,338.91

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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.