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Finding the Fourth Proportional to 14,991, 20,687.91 and 8,276.61

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Solution

The fourth proportional to 14,991, 20,687.91 and 8,276.61 is: 11,421.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,991 : 20,687.91 = 8,276.61 : x
  2. Step 2: Convert to fraction form
    14,991/20,687.91 = 8,276.61/x
  3. Step 3: Cross multiply
    14,991x = 20,687.91 × 8,276.61
  4. Step 4: Simplify right side
    14,991x = 171,225,762.79
  5. Step 5: Solve for x
    x = 171,225,762.79/14,991
  6. Step 6: Final answer
    x = 11,421.90

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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.