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Finding the Fourth Proportional to 18,641.20, 25,728.54 and 10,688.80

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Solution

The fourth proportional to 18,641.20, 25,728.54 and 10,688.80 is: 14,752.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,641.20 : 25,728.54 = 10,688.80 : x
  2. Step 2: Convert to fraction form
    18,641.20/25,728.54 = 10,688.80/x
  3. Step 3: Cross multiply
    18,641.20x = 25,728.54 × 10,688.80
  4. Step 4: Simplify right side
    18,641.20x = 275,007,218.35
  5. Step 5: Solve for x
    x = 275,007,218.35/18,641.20
  6. Step 6: Final answer
    x = 14,752.66

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.