Home / 21,109.74-29,131.61-11,678.91

Finding the Fourth Proportional to 21,109.74, 29,131.61 and 11,678.91

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Solution

The fourth proportional to 21,109.74, 29,131.61 and 11,678.91 is: 16,116.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.74 : 29,131.61 = 11,678.91 : x
  2. Step 2: Convert to fraction form
    21,109.74/29,131.61 = 11,678.91/x
  3. Step 3: Cross multiply
    21,109.74x = 29,131.61 × 11,678.91
  4. Step 4: Simplify right side
    21,109.74x = 340,225,451.35
  5. Step 5: Solve for x
    x = 340,225,451.35/21,109.74
  6. Step 6: Final answer
    x = 16,116.99

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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.