Home / 21,899.69-30,221.57-11,963.69

Finding the Fourth Proportional to 21,899.69, 30,221.57 and 11,963.69

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Solution

The fourth proportional to 21,899.69, 30,221.57 and 11,963.69 is: 16,509.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,899.69 : 30,221.57 = 11,963.69 : x
  2. Step 2: Convert to fraction form
    21,899.69/30,221.57 = 11,963.69/x
  3. Step 3: Cross multiply
    21,899.69x = 30,221.57 × 11,963.69
  4. Step 4: Simplify right side
    21,899.69x = 361,561,494.79
  5. Step 5: Solve for x
    x = 361,561,494.79/21,899.69
  6. Step 6: Final answer
    x = 16,509.89

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Half scale
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Double scale
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Similar ratio
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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.