Home / 3,929.08-5,421.89-2,160.69

Finding the Fourth Proportional to 3,929.08, 5,421.89 and 2,160.69

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Solution

The fourth proportional to 3,929.08, 5,421.89 and 2,160.69 is: 2,981.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.08 : 5,421.89 = 2,160.69 : x
  2. Step 2: Convert to fraction form
    3,929.08/5,421.89 = 2,160.69/x
  3. Step 3: Cross multiply
    3,929.08x = 5,421.89 × 2,160.69
  4. Step 4: Simplify right side
    3,929.08x = 11,715,023.50
  5. Step 5: Solve for x
    x = 11,715,023.50/3,929.08
  6. Step 6: Final answer
    x = 2,981.62

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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.