Home / 20,891.40-28,828.02-11,817.75

Finding the Fourth Proportional to 20,891.40, 28,828.02 and 11,817.75

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Solution

The fourth proportional to 20,891.40, 28,828.02 and 11,817.75 is: 16,307.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.40 : 28,828.02 = 11,817.75 : x
  2. Step 2: Convert to fraction form
    20,891.40/28,828.02 = 11,817.75/x
  3. Step 3: Cross multiply
    20,891.40x = 28,828.02 × 11,817.75
  4. Step 4: Simplify right side
    20,891.40x = 340,682,333.36
  5. Step 5: Solve for x
    x = 340,682,333.36/20,891.40
  6. Step 6: Final answer
    x = 16,307.30

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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.