Home / 13,689.96-18,774.28-13,121.88

Finding the Fourth Proportional to 13,689.96, 18,774.28 and 13,121.88

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Solution

The fourth proportional to 13,689.96, 18,774.28 and 13,121.88 is: 17,995.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.96 : 18,774.28 = 13,121.88 : x
  2. Step 2: Convert to fraction form
    13,689.96/18,774.28 = 13,121.88/x
  3. Step 3: Cross multiply
    13,689.96x = 18,774.28 × 13,121.88
  4. Step 4: Simplify right side
    13,689.96x = 246,353,849.25
  5. Step 5: Solve for x
    x = 246,353,849.25/13,689.96
  6. Step 6: Final answer
    x = 17,995.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.