Home / 20,812.76-28,719.32-12,315.20

Finding the Fourth Proportional to 20,812.76, 28,719.32 and 12,315.20

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Solution

The fourth proportional to 20,812.76, 28,719.32 and 12,315.20 is: 16,993.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.76 : 28,719.32 = 12,315.20 : x
  2. Step 2: Convert to fraction form
    20,812.76/28,719.32 = 12,315.20/x
  3. Step 3: Cross multiply
    20,812.76x = 28,719.32 × 12,315.20
  4. Step 4: Simplify right side
    20,812.76x = 353,684,169.66
  5. Step 5: Solve for x
    x = 353,684,169.66/20,812.76
  6. Step 6: Final answer
    x = 16,993.62

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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.