Home / 20,821.14-31,231.72-5,238.76

Finding the Fourth Proportional to 20,821.14, 31,231.72 and 5,238.76

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Solution

The fourth proportional to 20,821.14, 31,231.72 and 5,238.76 is: 7,858.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.14 : 31,231.72 = 5,238.76 : x
  2. Step 2: Convert to fraction form
    20,821.14/31,231.72 = 5,238.76/x
  3. Step 3: Cross multiply
    20,821.14x = 31,231.72 × 5,238.76
  4. Step 4: Simplify right side
    20,821.14x = 163,615,485.47
  5. Step 5: Solve for x
    x = 163,615,485.47/20,821.14
  6. Step 6: Final answer
    x = 7,858.14

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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.