Home / 20,779.91-28,678.34-12,396.41

Finding the Fourth Proportional to 20,779.91, 28,678.34 and 12,396.41

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Solution

The fourth proportional to 20,779.91, 28,678.34 and 12,396.41 is: 17,108.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.91 : 28,678.34 = 12,396.41 : x
  2. Step 2: Convert to fraction form
    20,779.91/28,678.34 = 12,396.41/x
  3. Step 3: Cross multiply
    20,779.91x = 28,678.34 × 12,396.41
  4. Step 4: Simplify right side
    20,779.91x = 355,508,460.76
  5. Step 5: Solve for x
    x = 355,508,460.76/20,779.91
  6. Step 6: Final answer
    x = 17,108.28

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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.