Home / 21,139.09-29,171.88-11,707.65

Finding the Fourth Proportional to 21,139.09, 29,171.88 and 11,707.65

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Solution

The fourth proportional to 21,139.09, 29,171.88 and 11,707.65 is: 16,156.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.09 : 29,171.88 = 11,707.65 : x
  2. Step 2: Convert to fraction form
    21,139.09/29,171.88 = 11,707.65/x
  3. Step 3: Cross multiply
    21,139.09x = 29,171.88 × 11,707.65
  4. Step 4: Simplify right side
    21,139.09x = 341,534,160.88
  5. Step 5: Solve for x
    x = 341,534,160.88/21,139.09
  6. Step 6: Final answer
    x = 16,156.52

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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.