Home / 13,987.65-20,981.61-3,992.39

Finding the Fourth Proportional to 13,987.65, 20,981.61 and 3,992.39

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Solution

The fourth proportional to 13,987.65, 20,981.61 and 3,992.39 is: 5,988.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,987.65 : 20,981.61 = 3,992.39 : x
  2. Step 2: Convert to fraction form
    13,987.65/20,981.61 = 3,992.39/x
  3. Step 3: Cross multiply
    13,987.65x = 20,981.61 × 3,992.39
  4. Step 4: Simplify right side
    13,987.65x = 83,766,665.04
  5. Step 5: Solve for x
    x = 83,766,665.04/13,987.65
  6. Step 6: Final answer
    x = 5,988.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.