Home / 13,139.75-18,128.10-10,115.79

Finding the Fourth Proportional to 13,139.75, 18,128.10 and 10,115.79

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Solution

The fourth proportional to 13,139.75, 18,128.10 and 10,115.79 is: 13,956.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.75 : 18,128.10 = 10,115.79 : x
  2. Step 2: Convert to fraction form
    13,139.75/18,128.10 = 10,115.79/x
  3. Step 3: Cross multiply
    13,139.75x = 18,128.10 × 10,115.79
  4. Step 4: Simplify right side
    13,139.75x = 183,380,052.70
  5. Step 5: Solve for x
    x = 183,380,052.70/13,139.75
  6. Step 6: Final answer
    x = 13,956.13

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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.