Home / 20,951.72-31,419.34-7,621.56

Finding the Fourth Proportional to 20,951.72, 31,419.34 and 7,621.56

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Solution

The fourth proportional to 20,951.72, 31,419.34 and 7,621.56 is: 11,429.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.72 : 31,419.34 = 7,621.56 : x
  2. Step 2: Convert to fraction form
    20,951.72/31,419.34 = 7,621.56/x
  3. Step 3: Cross multiply
    20,951.72x = 31,419.34 × 7,621.56
  4. Step 4: Simplify right side
    20,951.72x = 239,464,384.97
  5. Step 5: Solve for x
    x = 239,464,384.97/20,951.72
  6. Step 6: Final answer
    x = 11,429.34

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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.