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Finding the Fourth Proportional to 12,640.99, 18,963.90 and 3,875.98

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Solution

The fourth proportional to 12,640.99, 18,963.90 and 3,875.98 is: 5,814.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.99 : 18,963.90 = 3,875.98 : x
  2. Step 2: Convert to fraction form
    12,640.99/18,963.90 = 3,875.98/x
  3. Step 3: Cross multiply
    12,640.99x = 18,963.90 × 3,875.98
  4. Step 4: Simplify right side
    12,640.99x = 73,503,697.12
  5. Step 5: Solve for x
    x = 73,503,697.12/12,640.99
  6. Step 6: Final answer
    x = 5,814.71

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1.5x scale

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.