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Finding the Fourth Proportional to 18,920.99, 25,921.88 and 18,211.58

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Solution

The fourth proportional to 18,920.99, 25,921.88 and 18,211.58 is: 24,949.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,920.99 : 25,921.88 = 18,211.58 : x
  2. Step 2: Convert to fraction form
    18,920.99/25,921.88 = 18,211.58/x
  3. Step 3: Cross multiply
    18,920.99x = 25,921.88 × 18,211.58
  4. Step 4: Simplify right side
    18,920.99x = 472,078,433.41
  5. Step 5: Solve for x
    x = 472,078,433.41/18,920.99
  6. Step 6: Final answer
    x = 24,949.99

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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.