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Finding the Fourth Proportional to 18,697.80, 28,039.50 and 6,385.80

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Solution

The fourth proportional to 18,697.80, 28,039.50 and 6,385.80 is: 9,576.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,697.80 : 28,039.50 = 6,385.80 : x
  2. Step 2: Convert to fraction form
    18,697.80/28,039.50 = 6,385.80/x
  3. Step 3: Cross multiply
    18,697.80x = 28,039.50 × 6,385.80
  4. Step 4: Simplify right side
    18,697.80x = 179,054,639.10
  5. Step 5: Solve for x
    x = 179,054,639.10/18,697.80
  6. Step 6: Final answer
    x = 9,576.24

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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.