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Finding the Fourth Proportional to 18,662.76, 25,764.84 and 13,621.80

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Solution

The fourth proportional to 18,662.76, 25,764.84 and 13,621.80 is: 18,805.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,662.76 : 25,764.84 = 13,621.80 : x
  2. Step 2: Convert to fraction form
    18,662.76/25,764.84 = 13,621.80/x
  3. Step 3: Cross multiply
    18,662.76x = 25,764.84 × 13,621.80
  4. Step 4: Simplify right side
    18,662.76x = 350,963,497.51
  5. Step 5: Solve for x
    x = 350,963,497.51/18,662.76
  6. Step 6: Final answer
    x = 18,805.55

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Half scale
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Double scale
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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.