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Finding the Fourth Proportional to 1,367.21, 1,886.90 and 777.87

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Solution

The fourth proportional to 1,367.21, 1,886.90 and 777.87 is: 1,073.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,367.21 : 1,886.90 = 777.87 : x
  2. Step 2: Convert to fraction form
    1,367.21/1,886.90 = 777.87/x
  3. Step 3: Cross multiply
    1,367.21x = 1,886.90 × 777.87
  4. Step 4: Simplify right side
    1,367.21x = 1,467,759.01
  5. Step 5: Solve for x
    x = 1,467,759.01/1,367.21
  6. Step 6: Final answer
    x = 1,073.54

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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.