Home / 21,390.09-29,519.28-11,958.65

Finding the Fourth Proportional to 21,390.09, 29,519.28 and 11,958.65

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Solution

The fourth proportional to 21,390.09, 29,519.28 and 11,958.65 is: 16,503.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.09 : 29,519.28 = 11,958.65 : x
  2. Step 2: Convert to fraction form
    21,390.09/29,519.28 = 11,958.65/x
  3. Step 3: Cross multiply
    21,390.09x = 29,519.28 × 11,958.65
  4. Step 4: Simplify right side
    21,390.09x = 353,010,700.87
  5. Step 5: Solve for x
    x = 353,010,700.87/21,390.09
  6. Step 6: Final answer
    x = 16,503.47

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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.