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Finding the Fourth Proportional to 14,955.91, 20,639.21 and 8,991

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Solution

The fourth proportional to 14,955.91, 20,639.21 and 8,991 is: 12,407.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,955.91 : 20,639.21 = 8,991 : x
  2. Step 2: Convert to fraction form
    14,955.91/20,639.21 = 8,991/x
  3. Step 3: Cross multiply
    14,955.91x = 20,639.21 × 8,991
  4. Step 4: Simplify right side
    14,955.91x = 185,567,092.16
  5. Step 5: Solve for x
    x = 185,567,092.16/14,955.91
  6. Step 6: Final answer
    x = 12,407.61

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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.