Home / 2,917.78-4,378.49-1,186.40

Finding the Fourth Proportional to 2,917.78, 4,378.49 and 1,186.40

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Solution

The fourth proportional to 2,917.78, 4,378.49 and 1,186.40 is: 1,780.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,917.78 : 4,378.49 = 1,186.40 : x
  2. Step 2: Convert to fraction form
    2,917.78/4,378.49 = 1,186.40/x
  3. Step 3: Cross multiply
    2,917.78x = 4,378.49 × 1,186.40
  4. Step 4: Simplify right side
    2,917.78x = 5,194,634.60
  5. Step 5: Solve for x
    x = 5,194,634.60/2,917.78
  6. Step 6: Final answer
    x = 1,780.34

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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.