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Finding the Fourth Proportional to 28,905.90, 43,365.15 and 16,431.90

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Solution

The fourth proportional to 28,905.90, 43,365.15 and 16,431.90 is: 24,651.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,905.90 : 43,365.15 = 16,431.90 : x
  2. Step 2: Convert to fraction form
    28,905.90/43,365.15 = 16,431.90/x
  3. Step 3: Cross multiply
    28,905.90x = 43,365.15 × 16,431.90
  4. Step 4: Simplify right side
    28,905.90x = 712,571,808.29
  5. Step 5: Solve for x
    x = 712,571,808.29/28,905.90
  6. Step 6: Final answer
    x = 24,651.43

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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.