Home / 20,561.49-28,374.83-11,130.09

Finding the Fourth Proportional to 20,561.49, 28,374.83 and 11,130.09

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Solution

The fourth proportional to 20,561.49, 28,374.83 and 11,130.09 is: 15,359.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.49 : 28,374.83 = 11,130.09 : x
  2. Step 2: Convert to fraction form
    20,561.49/28,374.83 = 11,130.09/x
  3. Step 3: Cross multiply
    20,561.49x = 28,374.83 × 11,130.09
  4. Step 4: Simplify right side
    20,561.49x = 315,814,355.98
  5. Step 5: Solve for x
    x = 315,814,355.98/20,561.49
  6. Step 6: Final answer
    x = 15,359.51

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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.