Home / 20,890.38-28,830.56-11,460.77

Finding the Fourth Proportional to 20,890.38, 28,830.56 and 11,460.77

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Solution

The fourth proportional to 20,890.38, 28,830.56 and 11,460.77 is: 15,816.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.38 : 28,830.56 = 11,460.77 : x
  2. Step 2: Convert to fraction form
    20,890.38/28,830.56 = 11,460.77/x
  3. Step 3: Cross multiply
    20,890.38x = 28,830.56 × 11,460.77
  4. Step 4: Simplify right side
    20,890.38x = 330,420,215.67
  5. Step 5: Solve for x
    x = 330,420,215.67/20,890.38
  6. Step 6: Final answer
    x = 15,816.86

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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.