Home / 20,930.24-28,885.35-11,980.55

Finding the Fourth Proportional to 20,930.24, 28,885.35 and 11,980.55

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Solution

The fourth proportional to 20,930.24, 28,885.35 and 11,980.55 is: 16,534.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.24 : 28,885.35 = 11,980.55 : x
  2. Step 2: Convert to fraction form
    20,930.24/28,885.35 = 11,980.55/x
  3. Step 3: Cross multiply
    20,930.24x = 28,885.35 × 11,980.55
  4. Step 4: Simplify right side
    20,930.24x = 346,062,379.94
  5. Step 5: Solve for x
    x = 346,062,379.94/20,930.24
  6. Step 6: Final answer
    x = 16,534.09

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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.