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Finding the Fourth Proportional to 18,810.63, 28,215.81 and 4,959.63

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Solution

The fourth proportional to 18,810.63, 28,215.81 and 4,959.63 is: 7,439.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,810.63 : 28,215.81 = 4,959.63 : x
  2. Step 2: Convert to fraction form
    18,810.63/28,215.81 = 4,959.63/x
  3. Step 3: Cross multiply
    18,810.63x = 28,215.81 × 4,959.63
  4. Step 4: Simplify right side
    18,810.63x = 139,939,977.75
  5. Step 5: Solve for x
    x = 139,939,977.75/18,810.63
  6. Step 6: Final answer
    x = 7,439.41

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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.