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Finding the Fourth Proportional to 18,939.71, 28,409.55 and 7,252.93

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Solution

The fourth proportional to 18,939.71, 28,409.55 and 7,252.93 is: 10,879.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.71 : 28,409.55 = 7,252.93 : x
  2. Step 2: Convert to fraction form
    18,939.71/28,409.55 = 7,252.93/x
  3. Step 3: Cross multiply
    18,939.71x = 28,409.55 × 7,252.93
  4. Step 4: Simplify right side
    18,939.71x = 206,052,477.48
  5. Step 5: Solve for x
    x = 206,052,477.48/18,939.71
  6. Step 6: Final answer
    x = 10,879.39

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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.