Home / 2,117.74-2,921.20-1,399.92

Finding the Fourth Proportional to 2,117.74, 2,921.20 and 1,399.92

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Solution

The fourth proportional to 2,117.74, 2,921.20 and 1,399.92 is: 1,931.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.74 : 2,921.20 = 1,399.92 : x
  2. Step 2: Convert to fraction form
    2,117.74/2,921.20 = 1,399.92/x
  3. Step 3: Cross multiply
    2,117.74x = 2,921.20 × 1,399.92
  4. Step 4: Simplify right side
    2,117.74x = 4,089,446.30
  5. Step 5: Solve for x
    x = 4,089,446.30/2,117.74
  6. Step 6: Final answer
    x = 1,931.04

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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.