Home / 20,678.72-31,023.27-6,640.00

Finding the Fourth Proportional to 20,678.72, 31,023.27 and 6,640.00

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Solution

The fourth proportional to 20,678.72, 31,023.27 and 6,640.00 is: 9,961.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,678.72 : 31,023.27 = 6,640.00 : x
  2. Step 2: Convert to fraction form
    20,678.72/31,023.27 = 6,640.00/x
  3. Step 3: Cross multiply
    20,678.72x = 31,023.27 × 6,640.00
  4. Step 4: Simplify right side
    20,678.72x = 205,994,435.24
  5. Step 5: Solve for x
    x = 205,994,435.24/20,678.72
  6. Step 6: Final answer
    x = 9,961.67

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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.