Home / 20,890.50-28,828.89-11,459.09

Finding the Fourth Proportional to 20,890.50, 28,828.89 and 11,459.09

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Solution

The fourth proportional to 20,890.50, 28,828.89 and 11,459.09 is: 15,813.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.50 : 28,828.89 = 11,459.09 : x
  2. Step 2: Convert to fraction form
    20,890.50/28,828.89 = 11,459.09/x
  3. Step 3: Cross multiply
    20,890.50x = 28,828.89 × 11,459.09
  4. Step 4: Simplify right side
    20,890.50x = 330,352,700.97
  5. Step 5: Solve for x
    x = 330,352,700.97/20,890.50
  6. Step 6: Final answer
    x = 15,813.54

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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.