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Finding the Fourth Proportional to 18,921, 28,226.76 and 17,578.56

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Solution

The fourth proportional to 18,921, 28,226.76 and 17,578.56 is: 26,224.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921 : 28,226.76 = 17,578.56 : x
  2. Step 2: Convert to fraction form
    18,921/28,226.76 = 17,578.56/x
  3. Step 3: Cross multiply
    18,921x = 28,226.76 × 17,578.56
  4. Step 4: Simplify right side
    18,921x = 496,185,794.27
  5. Step 5: Solve for x
    x = 496,185,794.27/18,921
  6. Step 6: Final answer
    x = 26,224.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.