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Finding the Fourth Proportional to 13,687.85, 18,889.27 and 7,400.27

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Solution

The fourth proportional to 13,687.85, 18,889.27 and 7,400.27 is: 10,212.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.85 : 18,889.27 = 7,400.27 : x
  2. Step 2: Convert to fraction form
    13,687.85/18,889.27 = 7,400.27/x
  3. Step 3: Cross multiply
    13,687.85x = 18,889.27 × 7,400.27
  4. Step 4: Simplify right side
    13,687.85x = 139,785,603.66
  5. Step 5: Solve for x
    x = 139,785,603.66/13,687.85
  6. Step 6: Final answer
    x = 10,212.39

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1.5x scale

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.