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Finding the Fourth Proportional to 18,374, 25,356.12 and 9,990.56

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Solution

The fourth proportional to 18,374, 25,356.12 and 9,990.56 is: 13,786.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,374 : 25,356.12 = 9,990.56 : x
  2. Step 2: Convert to fraction form
    18,374/25,356.12 = 9,990.56/x
  3. Step 3: Cross multiply
    18,374x = 25,356.12 × 9,990.56
  4. Step 4: Simplify right side
    18,374x = 253,321,838.23
  5. Step 5: Solve for x
    x = 253,321,838.23/18,374
  6. Step 6: Final answer
    x = 13,786.97

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Why These Related Problems?

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