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Finding the Fourth Proportional to 1,278.56, 1,906.65 and 1,266.89

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Solution

The fourth proportional to 1,278.56, 1,906.65 and 1,266.89 is: 1,889.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.56 : 1,906.65 = 1,266.89 : x
  2. Step 2: Convert to fraction form
    1,278.56/1,906.65 = 1,266.89/x
  3. Step 3: Cross multiply
    1,278.56x = 1,906.65 × 1,266.89
  4. Step 4: Simplify right side
    1,278.56x = 2,415,509.45
  5. Step 5: Solve for x
    x = 2,415,509.45/1,278.56
  6. Step 6: Final answer
    x = 1,889.24

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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.