Home / 81,779.07-122,668.60-21,807.75

Finding the Fourth Proportional to 81,779.07, 122,668.60 and 21,807.75

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Solution

The fourth proportional to 81,779.07, 122,668.60 and 21,807.75 is: 32,711.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,779.07 : 122,668.60 = 21,807.75 : x
  2. Step 2: Convert to fraction form
    81,779.07/122,668.60 = 21,807.75/x
  3. Step 3: Cross multiply
    81,779.07x = 122,668.60 × 21,807.75
  4. Step 4: Simplify right side
    81,779.07x = 2,675,126,161.65
  5. Step 5: Solve for x
    x = 2,675,126,161.65/81,779.07
  6. Step 6: Final answer
    x = 32,711.62

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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.