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Finding the Fourth Proportional to 18,711.65, 25,821.43 and 11,154.08

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Solution

The fourth proportional to 18,711.65, 25,821.43 and 11,154.08 is: 15,392.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711.65 : 25,821.43 = 11,154.08 : x
  2. Step 2: Convert to fraction form
    18,711.65/25,821.43 = 11,154.08/x
  3. Step 3: Cross multiply
    18,711.65x = 25,821.43 × 11,154.08
  4. Step 4: Simplify right side
    18,711.65x = 288,014,111.06
  5. Step 5: Solve for x
    x = 288,014,111.06/18,711.65
  6. Step 6: Final answer
    x = 15,392.24

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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.