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Finding the Fourth Proportional to 18,978.72, 28,445 and 13,433.66

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Solution

The fourth proportional to 18,978.72, 28,445 and 13,433.66 is: 20,134.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.72 : 28,445 = 13,433.66 : x
  2. Step 2: Convert to fraction form
    18,978.72/28,445 = 13,433.66/x
  3. Step 3: Cross multiply
    18,978.72x = 28,445 × 13,433.66
  4. Step 4: Simplify right side
    18,978.72x = 382,120,458.70
  5. Step 5: Solve for x
    x = 382,120,458.70/18,978.72
  6. Step 6: Final answer
    x = 20,134.15

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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.