Home / 21,260.80-31,879.20-8,113.60

Finding the Fourth Proportional to 21,260.80, 31,879.20 and 8,113.60

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Solution

The fourth proportional to 21,260.80, 31,879.20 and 8,113.60 is: 12,165.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,260.80 : 31,879.20 = 8,113.60 : x
  2. Step 2: Convert to fraction form
    21,260.80/31,879.20 = 8,113.60/x
  3. Step 3: Cross multiply
    21,260.80x = 31,879.20 × 8,113.60
  4. Step 4: Simplify right side
    21,260.80x = 258,655,077.12
  5. Step 5: Solve for x
    x = 258,655,077.12/21,260.80
  6. Step 6: Final answer
    x = 12,165.82

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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.