Home / 2,121.60-3,165.76-2,109.44

Finding the Fourth Proportional to 2,121.60, 3,165.76 and 2,109.44

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Solution

The fourth proportional to 2,121.60, 3,165.76 and 2,109.44 is: 3,147.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.60 : 3,165.76 = 2,109.44 : x
  2. Step 2: Convert to fraction form
    2,121.60/3,165.76 = 2,109.44/x
  3. Step 3: Cross multiply
    2,121.60x = 3,165.76 × 2,109.44
  4. Step 4: Simplify right side
    2,121.60x = 6,677,980.77
  5. Step 5: Solve for x
    x = 6,677,980.77/2,121.60
  6. Step 6: Final answer
    x = 3,147.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.