Home / 20,879.73-28,814.12-11,319.78

Finding the Fourth Proportional to 20,879.73, 28,814.12 and 11,319.78

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Solution

The fourth proportional to 20,879.73, 28,814.12 and 11,319.78 is: 15,621.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.73 : 28,814.12 = 11,319.78 : x
  2. Step 2: Convert to fraction form
    20,879.73/28,814.12 = 11,319.78/x
  3. Step 3: Cross multiply
    20,879.73x = 28,814.12 × 11,319.78
  4. Step 4: Simplify right side
    20,879.73x = 326,169,499.29
  5. Step 5: Solve for x
    x = 326,169,499.29/20,879.73
  6. Step 6: Final answer
    x = 15,621.35

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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.