Home / 1,278.60-1,917.47-445.45

Finding the Fourth Proportional to 1,278.60, 1,917.47 and 445.45

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Solution

The fourth proportional to 1,278.60, 1,917.47 and 445.45 is: 668.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.60 : 1,917.47 = 445.45 : x
  2. Step 2: Convert to fraction form
    1,278.60/1,917.47 = 445.45/x
  3. Step 3: Cross multiply
    1,278.60x = 1,917.47 × 445.45
  4. Step 4: Simplify right side
    1,278.60x = 854,137.01
  5. Step 5: Solve for x
    x = 854,137.01/1,278.60
  6. Step 6: Final answer
    x = 668.03

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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.