Home / 3,420.35-4,718.40-2,160.80

Finding the Fourth Proportional to 3,420.35, 4,718.40 and 2,160.80

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Solution

The fourth proportional to 3,420.35, 4,718.40 and 2,160.80 is: 2,980.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,420.35 : 4,718.40 = 2,160.80 : x
  2. Step 2: Convert to fraction form
    3,420.35/4,718.40 = 2,160.80/x
  3. Step 3: Cross multiply
    3,420.35x = 4,718.40 × 2,160.80
  4. Step 4: Simplify right side
    3,420.35x = 10,195,518.72
  5. Step 5: Solve for x
    x = 10,195,518.72/3,420.35
  6. Step 6: Final answer
    x = 2,980.84

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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.