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Finding the Fourth Proportional to 18,859.63, 28,252.08 and 12,921.92

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Solution

The fourth proportional to 18,859.63, 28,252.08 and 12,921.92 is: 19,357.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,859.63 : 28,252.08 = 12,921.92 : x
  2. Step 2: Convert to fraction form
    18,859.63/28,252.08 = 12,921.92/x
  3. Step 3: Cross multiply
    18,859.63x = 28,252.08 × 12,921.92
  4. Step 4: Simplify right side
    18,859.63x = 365,071,093.33
  5. Step 5: Solve for x
    x = 365,071,093.33/18,859.63
  6. Step 6: Final answer
    x = 19,357.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.