Home / 20,879.18-28,813.36-11,319.08

Finding the Fourth Proportional to 20,879.18, 28,813.36 and 11,319.08

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Solution

The fourth proportional to 20,879.18, 28,813.36 and 11,319.08 is: 15,620.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.18 : 28,813.36 = 11,319.08 : x
  2. Step 2: Convert to fraction form
    20,879.18/28,813.36 = 11,319.08/x
  3. Step 3: Cross multiply
    20,879.18x = 28,813.36 × 11,319.08
  4. Step 4: Simplify right side
    20,879.18x = 326,140,726.91
  5. Step 5: Solve for x
    x = 326,140,726.91/20,879.18
  6. Step 6: Final answer
    x = 15,620.38

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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.