Home / 21,117.97-28,987.54-18,674.39

Finding the Fourth Proportional to 21,117.97, 28,987.54 and 18,674.39

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Solution

The fourth proportional to 21,117.97, 28,987.54 and 18,674.39 is: 25,633.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,117.97 : 28,987.54 = 18,674.39 : x
  2. Step 2: Convert to fraction form
    21,117.97/28,987.54 = 18,674.39/x
  3. Step 3: Cross multiply
    21,117.97x = 28,987.54 × 18,674.39
  4. Step 4: Simplify right side
    21,117.97x = 541,324,627.10
  5. Step 5: Solve for x
    x = 541,324,627.10/21,117.97
  6. Step 6: Final answer
    x = 25,633.36

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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 (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.