Home / 20,285.88-30,429.03-7,138.38

Finding the Fourth Proportional to 20,285.88, 30,429.03 and 7,138.38

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Solution

The fourth proportional to 20,285.88, 30,429.03 and 7,138.38 is: 10,707.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,285.88 : 30,429.03 = 7,138.38 : x
  2. Step 2: Convert to fraction form
    20,285.88/30,429.03 = 7,138.38/x
  3. Step 3: Cross multiply
    20,285.88x = 30,429.03 × 7,138.38
  4. Step 4: Simplify right side
    20,285.88x = 217,213,979.17
  5. Step 5: Solve for x
    x = 217,213,979.17/20,285.88
  6. Step 6: Final answer
    x = 10,707.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.