Home / 20,810.77-28,721.55-11,861.49

Finding the Fourth Proportional to 20,810.77, 28,721.55 and 11,861.49

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Solution

The fourth proportional to 20,810.77, 28,721.55 and 11,861.49 is: 16,370.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.77 : 28,721.55 = 11,861.49 : x
  2. Step 2: Convert to fraction form
    20,810.77/28,721.55 = 11,861.49/x
  3. Step 3: Cross multiply
    20,810.77x = 28,721.55 × 11,861.49
  4. Step 4: Simplify right side
    20,810.77x = 340,680,378.11
  5. Step 5: Solve for x
    x = 340,680,378.11/20,810.77
  6. Step 6: Final answer
    x = 16,370.39

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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.