Home / 3,128.08-4,315.20-2,135.68

Finding the Fourth Proportional to 3,128.08, 4,315.20 and 2,135.68

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Solution

The fourth proportional to 3,128.08, 4,315.20 and 2,135.68 is: 2,946.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.08 : 4,315.20 = 2,135.68 : x
  2. Step 2: Convert to fraction form
    3,128.08/4,315.20 = 2,135.68/x
  3. Step 3: Cross multiply
    3,128.08x = 4,315.20 × 2,135.68
  4. Step 4: Simplify right side
    3,128.08x = 9,215,886.34
  5. Step 5: Solve for x
    x = 9,215,886.34/3,128.08
  6. Step 6: Final answer
    x = 2,946.18

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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.