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Finding the Fourth Proportional to 18,984.89, 28,472.11 and 5,657.28

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Solution

The fourth proportional to 18,984.89, 28,472.11 and 5,657.28 is: 8,484.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,984.89 : 28,472.11 = 5,657.28 : x
  2. Step 2: Convert to fraction form
    18,984.89/28,472.11 = 5,657.28/x
  3. Step 3: Cross multiply
    18,984.89x = 28,472.11 × 5,657.28
  4. Step 4: Simplify right side
    18,984.89x = 161,074,698.46
  5. Step 5: Solve for x
    x = 161,074,698.46/18,984.89
  6. Step 6: Final answer
    x = 8,484.37

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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.