Home / 20,879.90-31,325.16-6,840.87

Finding the Fourth Proportional to 20,879.90, 31,325.16 and 6,840.87

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Solution

The fourth proportional to 20,879.90, 31,325.16 and 6,840.87 is: 10,263.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.90 : 31,325.16 = 6,840.87 : x
  2. Step 2: Convert to fraction form
    20,879.90/31,325.16 = 6,840.87/x
  3. Step 3: Cross multiply
    20,879.90x = 31,325.16 × 6,840.87
  4. Step 4: Simplify right side
    20,879.90x = 214,291,451.93
  5. Step 5: Solve for x
    x = 214,291,451.93/20,879.90
  6. Step 6: Final answer
    x = 10,263.05

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1.5x scale

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.