Home / 20,921.14-31,381.70-5,338.77

Finding the Fourth Proportional to 20,921.14, 31,381.70 and 5,338.77

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Solution

The fourth proportional to 20,921.14, 31,381.70 and 5,338.77 is: 8,008.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.14 : 31,381.70 = 5,338.77 : x
  2. Step 2: Convert to fraction form
    20,921.14/31,381.70 = 5,338.77/x
  3. Step 3: Cross multiply
    20,921.14x = 31,381.70 × 5,338.77
  4. Step 4: Simplify right side
    20,921.14x = 167,539,573.36
  5. Step 5: Solve for x
    x = 167,539,573.36/20,921.14
  6. Step 6: Final answer
    x = 8,008.15

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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.