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Finding the Fourth Proportional to 18,751.10, 28,131.30 and 15,424.63

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Solution

The fourth proportional to 18,751.10, 28,131.30 and 15,424.63 is: 23,140.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.10 : 28,131.30 = 15,424.63 : x
  2. Step 2: Convert to fraction form
    18,751.10/28,131.30 = 15,424.63/x
  3. Step 3: Cross multiply
    18,751.10x = 28,131.30 × 15,424.63
  4. Step 4: Simplify right side
    18,751.10x = 433,914,823.59
  5. Step 5: Solve for x
    x = 433,914,823.59/18,751.10
  6. Step 6: Final answer
    x = 23,140.77

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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.