Home / 21,115.07-31,609.51-12,769.85

Finding the Fourth Proportional to 21,115.07, 31,609.51 and 12,769.85

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Solution

The fourth proportional to 21,115.07, 31,609.51 and 12,769.85 is: 19,116.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.07 : 31,609.51 = 12,769.85 : x
  2. Step 2: Convert to fraction form
    21,115.07/31,609.51 = 12,769.85/x
  3. Step 3: Cross multiply
    21,115.07x = 31,609.51 × 12,769.85
  4. Step 4: Simplify right side
    21,115.07x = 403,648,511.30
  5. Step 5: Solve for x
    x = 403,648,511.30/21,115.07
  6. Step 6: Final answer
    x = 19,116.61

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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.