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Finding the Fourth Proportional to 28,663.21, 42,999.87 and 8,936.86

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Solution

The fourth proportional to 28,663.21, 42,999.87 and 8,936.86 is: 13,406.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,663.21 : 42,999.87 = 8,936.86 : x
  2. Step 2: Convert to fraction form
    28,663.21/42,999.87 = 8,936.86/x
  3. Step 3: Cross multiply
    28,663.21x = 42,999.87 × 8,936.86
  4. Step 4: Simplify right side
    28,663.21x = 384,283,818.21
  5. Step 5: Solve for x
    x = 384,283,818.21/28,663.21
  6. Step 6: Final answer
    x = 13,406.87

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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.