Home / 2,105.60-2,905.02-1,221.56

Finding the Fourth Proportional to 2,105.60, 2,905.02 and 1,221.56

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Solution

The fourth proportional to 2,105.60, 2,905.02 and 1,221.56 is: 1,685.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.60 : 2,905.02 = 1,221.56 : x
  2. Step 2: Convert to fraction form
    2,105.60/2,905.02 = 1,221.56/x
  3. Step 3: Cross multiply
    2,105.60x = 2,905.02 × 1,221.56
  4. Step 4: Simplify right side
    2,105.60x = 3,548,656.23
  5. Step 5: Solve for x
    x = 3,548,656.23/2,105.60
  6. Step 6: Final answer
    x = 1,685.34

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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.