Home / 20,779.99-31,180.43-9,687.55

Finding the Fourth Proportional to 20,779.99, 31,180.43 and 9,687.55

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Solution

The fourth proportional to 20,779.99, 31,180.43 and 9,687.55 is: 14,536.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.99 : 31,180.43 = 9,687.55 : x
  2. Step 2: Convert to fraction form
    20,779.99/31,180.43 = 9,687.55/x
  3. Step 3: Cross multiply
    20,779.99x = 31,180.43 × 9,687.55
  4. Step 4: Simplify right side
    20,779.99x = 302,061,974.65
  5. Step 5: Solve for x
    x = 302,061,974.65/20,779.99
  6. Step 6: Final answer
    x = 14,536.19

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1.5x scale

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.