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Finding the Fourth Proportional to 18,490.84, 27,710.32 and 12,321.88

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Solution

The fourth proportional to 18,490.84, 27,710.32 and 12,321.88 is: 18,465.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,490.84 : 27,710.32 = 12,321.88 : x
  2. Step 2: Convert to fraction form
    18,490.84/27,710.32 = 12,321.88/x
  3. Step 3: Cross multiply
    18,490.84x = 27,710.32 × 12,321.88
  4. Step 4: Simplify right side
    18,490.84x = 341,443,237.80
  5. Step 5: Solve for x
    x = 341,443,237.80/18,490.84
  6. Step 6: Final answer
    x = 18,465.53

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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.