Home / 13,720.14-18,940.86-8,689.62

Finding the Fourth Proportional to 13,720.14, 18,940.86 and 8,689.62

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Solution

The fourth proportional to 13,720.14, 18,940.86 and 8,689.62 is: 11,996.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.14 : 18,940.86 = 8,689.62 : x
  2. Step 2: Convert to fraction form
    13,720.14/18,940.86 = 8,689.62/x
  3. Step 3: Cross multiply
    13,720.14x = 18,940.86 × 8,689.62
  4. Step 4: Simplify right side
    13,720.14x = 164,588,875.87
  5. Step 5: Solve for x
    x = 164,588,875.87/13,720.14
  6. Step 6: Final answer
    x = 11,996.15

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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.