Home / 81,853.21-122,779.36-21,063.43

Finding the Fourth Proportional to 81,853.21, 122,779.36 and 21,063.43

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Solution

The fourth proportional to 81,853.21, 122,779.36 and 21,063.43 is: 31,595.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,853.21 : 122,779.36 = 21,063.43 : x
  2. Step 2: Convert to fraction form
    81,853.21/122,779.36 = 21,063.43/x
  3. Step 3: Cross multiply
    81,853.21x = 122,779.36 × 21,063.43
  4. Step 4: Simplify right side
    81,853.21x = 2,586,154,454.80
  5. Step 5: Solve for x
    x = 2,586,154,454.80/81,853.21
  6. Step 6: Final answer
    x = 31,595.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.