Home / 20,878.96-31,328.52-9,190.64

Finding the Fourth Proportional to 20,878.96, 31,328.52 and 9,190.64

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Solution

The fourth proportional to 20,878.96, 31,328.52 and 9,190.64 is: 13,790.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.96 : 31,328.52 = 9,190.64 : x
  2. Step 2: Convert to fraction form
    20,878.96/31,328.52 = 9,190.64/x
  3. Step 3: Cross multiply
    20,878.96x = 31,328.52 × 9,190.64
  4. Step 4: Simplify right side
    20,878.96x = 287,929,149.05
  5. Step 5: Solve for x
    x = 287,929,149.05/20,878.96
  6. Step 6: Final answer
    x = 13,790.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.