Home / 20,699.92-31,029.64-8,215.76

Finding the Fourth Proportional to 20,699.92, 31,029.64 and 8,215.76

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Solution

The fourth proportional to 20,699.92, 31,029.64 and 8,215.76 is: 12,315.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,699.92 : 31,029.64 = 8,215.76 : x
  2. Step 2: Convert to fraction form
    20,699.92/31,029.64 = 8,215.76/x
  3. Step 3: Cross multiply
    20,699.92x = 31,029.64 × 8,215.76
  4. Step 4: Simplify right side
    20,699.92x = 254,932,075.13
  5. Step 5: Solve for x
    x = 254,932,075.13/20,699.92
  6. Step 6: Final answer
    x = 12,315.61

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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.