Home / 21,128.10-31,646.58-19,885.99

Finding the Fourth Proportional to 21,128.10, 31,646.58 and 19,885.99

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Solution

The fourth proportional to 21,128.10, 31,646.58 and 19,885.99 is: 29,786.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.10 : 31,646.58 = 19,885.99 : x
  2. Step 2: Convert to fraction form
    21,128.10/31,646.58 = 19,885.99/x
  3. Step 3: Cross multiply
    21,128.10x = 31,646.58 × 19,885.99
  4. Step 4: Simplify right side
    21,128.10x = 629,323,573.41
  5. Step 5: Solve for x
    x = 629,323,573.41/21,128.10
  6. Step 6: Final answer
    x = 29,786.09

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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.