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Finding the Fourth Proportional to 15,581.99, 21,491.01 and 13,791.39

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Solution

The fourth proportional to 15,581.99, 21,491.01 and 13,791.39 is: 19,021.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,581.99 : 21,491.01 = 13,791.39 : x
  2. Step 2: Convert to fraction form
    15,581.99/21,491.01 = 13,791.39/x
  3. Step 3: Cross multiply
    15,581.99x = 21,491.01 × 13,791.39
  4. Step 4: Simplify right side
    15,581.99x = 296,390,900.40
  5. Step 5: Solve for x
    x = 296,390,900.40/15,581.99
  6. Step 6: Final answer
    x = 19,021.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.