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Finding the Fourth Proportional to 18,978.55, 28,466.97 and 6,499.69

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Solution

The fourth proportional to 18,978.55, 28,466.97 and 6,499.69 is: 9,749.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.55 : 28,466.97 = 6,499.69 : x
  2. Step 2: Convert to fraction form
    18,978.55/28,466.97 = 6,499.69/x
  3. Step 3: Cross multiply
    18,978.55x = 28,466.97 × 6,499.69
  4. Step 4: Simplify right side
    18,978.55x = 185,026,480.24
  5. Step 5: Solve for x
    x = 185,026,480.24/18,978.55
  6. Step 6: Final answer
    x = 9,749.24

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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.