Home / 15,929.88-21,910.12-12,779.16

Finding the Fourth Proportional to 15,929.88, 21,910.12 and 12,779.16

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Solution

The fourth proportional to 15,929.88, 21,910.12 and 12,779.16 is: 17,576.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,929.88 : 21,910.12 = 12,779.16 : x
  2. Step 2: Convert to fraction form
    15,929.88/21,910.12 = 12,779.16/x
  3. Step 3: Cross multiply
    15,929.88x = 21,910.12 × 12,779.16
  4. Step 4: Simplify right side
    15,929.88x = 279,992,929.10
  5. Step 5: Solve for x
    x = 279,992,929.10/15,929.88
  6. Step 6: Final answer
    x = 17,576.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.