Home / 20,978.46-31,467.08-9,878.83

Finding the Fourth Proportional to 20,978.46, 31,467.08 and 9,878.83

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Solution

The fourth proportional to 20,978.46, 31,467.08 and 9,878.83 is: 14,817.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.46 : 31,467.08 = 9,878.83 : x
  2. Step 2: Convert to fraction form
    20,978.46/31,467.08 = 9,878.83/x
  3. Step 3: Cross multiply
    20,978.46x = 31,467.08 × 9,878.83
  4. Step 4: Simplify right side
    20,978.46x = 310,857,879.95
  5. Step 5: Solve for x
    x = 310,857,879.95/20,978.46
  6. Step 6: Final answer
    x = 14,817.96

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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.