Home / 13,665.65-18,867.30-11,153.75

Finding the Fourth Proportional to 13,665.65, 18,867.30 and 11,153.75

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Solution

The fourth proportional to 13,665.65, 18,867.30 and 11,153.75 is: 15,399.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,665.65 : 18,867.30 = 11,153.75 : x
  2. Step 2: Convert to fraction form
    13,665.65/18,867.30 = 11,153.75/x
  3. Step 3: Cross multiply
    13,665.65x = 18,867.30 × 11,153.75
  4. Step 4: Simplify right side
    13,665.65x = 210,441,053.04
  5. Step 5: Solve for x
    x = 210,441,053.04/13,665.65
  6. Step 6: Final answer
    x = 15,399.28

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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.