Home / 2,911.60-4,018.86-1,980.64

Finding the Fourth Proportional to 2,911.60, 4,018.86 and 1,980.64

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Solution

The fourth proportional to 2,911.60, 4,018.86 and 1,980.64 is: 2,733.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,911.60 : 4,018.86 = 1,980.64 : x
  2. Step 2: Convert to fraction form
    2,911.60/4,018.86 = 1,980.64/x
  3. Step 3: Cross multiply
    2,911.60x = 4,018.86 × 1,980.64
  4. Step 4: Simplify right side
    2,911.60x = 7,959,914.87
  5. Step 5: Solve for x
    x = 7,959,914.87/2,911.60
  6. Step 6: Final answer
    x = 2,733.86

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1.5x scale

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.