Home / 21,231.99-31,880.88-11,390.49

Finding the Fourth Proportional to 21,231.99, 31,880.88 and 11,390.49

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Solution

The fourth proportional to 21,231.99, 31,880.88 and 11,390.49 is: 17,103.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,231.99 : 31,880.88 = 11,390.49 : x
  2. Step 2: Convert to fraction form
    21,231.99/31,880.88 = 11,390.49/x
  3. Step 3: Cross multiply
    21,231.99x = 31,880.88 × 11,390.49
  4. Step 4: Simplify right side
    21,231.99x = 363,138,844.83
  5. Step 5: Solve for x
    x = 363,138,844.83/21,231.99
  6. Step 6: Final answer
    x = 17,103.38

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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.