Home / 3,420.60-4,718.75-2,161.05

Finding the Fourth Proportional to 3,420.60, 4,718.75 and 2,161.05

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Solution

The fourth proportional to 3,420.60, 4,718.75 and 2,161.05 is: 2,981.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,420.60 : 4,718.75 = 2,161.05 : x
  2. Step 2: Convert to fraction form
    3,420.60/4,718.75 = 2,161.05/x
  3. Step 3: Cross multiply
    3,420.60x = 4,718.75 × 2,161.05
  4. Step 4: Simplify right side
    3,420.60x = 10,197,454.69
  5. Step 5: Solve for x
    x = 10,197,454.69/3,420.60
  6. Step 6: Final answer
    x = 2,981.19

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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.