Home / 13,719.39-18,939.83-8,688.87

Finding the Fourth Proportional to 13,719.39, 18,939.83 and 8,688.87

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Solution

The fourth proportional to 13,719.39, 18,939.83 and 8,688.87 is: 11,995.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,719.39 : 18,939.83 = 8,688.87 : x
  2. Step 2: Convert to fraction form
    13,719.39/18,939.83 = 8,688.87/x
  3. Step 3: Cross multiply
    13,719.39x = 18,939.83 × 8,688.87
  4. Step 4: Simplify right side
    13,719.39x = 164,565,677.25
  5. Step 5: Solve for x
    x = 164,565,677.25/13,719.39
  6. Step 6: Final answer
    x = 11,995.12

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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.