Home / 3,929.05-5,421.95-2,160.64

Finding the Fourth Proportional to 3,929.05, 5,421.95 and 2,160.64

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Solution

The fourth proportional to 3,929.05, 5,421.95 and 2,160.64 is: 2,981.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.05 : 5,421.95 = 2,160.64 : x
  2. Step 2: Convert to fraction form
    3,929.05/5,421.95 = 2,160.64/x
  3. Step 3: Cross multiply
    3,929.05x = 5,421.95 × 2,160.64
  4. Step 4: Simplify right side
    3,929.05x = 11,714,882.05
  5. Step 5: Solve for x
    x = 11,714,882.05/3,929.05
  6. Step 6: Final answer
    x = 2,981.61

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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.