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Finding the Fourth Proportional to 14,486.40, 19,980 and 11,124

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Solution

The fourth proportional to 14,486.40, 19,980 and 11,124 is: 15,342.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,486.40 : 19,980 = 11,124 : x
  2. Step 2: Convert to fraction form
    14,486.40/19,980 = 11,124/x
  3. Step 3: Cross multiply
    14,486.40x = 19,980 × 11,124
  4. Step 4: Simplify right side
    14,486.40x = 222,257,520
  5. Step 5: Solve for x
    x = 222,257,520/14,486.40
  6. Step 6: Final answer
    x = 15,342.50

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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.