Home / 1,917.20-2,875.19-821.27

Finding the Fourth Proportional to 1,917.20, 2,875.19 and 821.27

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Solution

The fourth proportional to 1,917.20, 2,875.19 and 821.27 is: 1,231.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.20 : 2,875.19 = 821.27 : x
  2. Step 2: Convert to fraction form
    1,917.20/2,875.19 = 821.27/x
  3. Step 3: Cross multiply
    1,917.20x = 2,875.19 × 821.27
  4. Step 4: Simplify right side
    1,917.20x = 2,361,288.81
  5. Step 5: Solve for x
    x = 2,361,288.81/1,917.20
  6. Step 6: Final answer
    x = 1,231.64

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1.5x scale

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.