Home / 20,800.65-28,718.75-12,305.49

Finding the Fourth Proportional to 20,800.65, 28,718.75 and 12,305.49

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Solution

The fourth proportional to 20,800.65, 28,718.75 and 12,305.49 is: 16,989.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.65 : 28,718.75 = 12,305.49 : x
  2. Step 2: Convert to fraction form
    20,800.65/28,718.75 = 12,305.49/x
  3. Step 3: Cross multiply
    20,800.65x = 28,718.75 × 12,305.49
  4. Step 4: Simplify right side
    20,800.65x = 353,398,290.94
  5. Step 5: Solve for x
    x = 353,398,290.94/20,800.65
  6. Step 6: Final answer
    x = 16,989.77

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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.