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Finding the Fourth Proportional to 15,321.99, 21,146.81 and 14,321.44

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Solution

The fourth proportional to 15,321.99, 21,146.81 and 14,321.44 is: 19,765.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,321.99 : 21,146.81 = 14,321.44 : x
  2. Step 2: Convert to fraction form
    15,321.99/21,146.81 = 14,321.44/x
  3. Step 3: Cross multiply
    15,321.99x = 21,146.81 × 14,321.44
  4. Step 4: Simplify right side
    15,321.99x = 302,852,593.27
  5. Step 5: Solve for x
    x = 302,852,593.27/15,321.99
  6. Step 6: Final answer
    x = 19,765.88

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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.