Home / 20,879.12-28,814.34-12,386.28

Finding the Fourth Proportional to 20,879.12, 28,814.34 and 12,386.28

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Solution

The fourth proportional to 20,879.12, 28,814.34 and 12,386.28 is: 17,093.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.12 : 28,814.34 = 12,386.28 : x
  2. Step 2: Convert to fraction form
    20,879.12/28,814.34 = 12,386.28/x
  3. Step 3: Cross multiply
    20,879.12x = 28,814.34 × 12,386.28
  4. Step 4: Simplify right side
    20,879.12x = 356,902,483.26
  5. Step 5: Solve for x
    x = 356,902,483.26/20,879.12
  6. Step 6: Final answer
    x = 17,093.75

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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.