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Finding the Fourth Proportional to 18,978.24, 28,471.36 and 5,831.36

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Solution

The fourth proportional to 18,978.24, 28,471.36 and 5,831.36 is: 8,748.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.24 : 28,471.36 = 5,831.36 : x
  2. Step 2: Convert to fraction form
    18,978.24/28,471.36 = 5,831.36/x
  3. Step 3: Cross multiply
    18,978.24x = 28,471.36 × 5,831.36
  4. Step 4: Simplify right side
    18,978.24x = 166,026,749.85
  5. Step 5: Solve for x
    x = 166,026,749.85/18,978.24
  6. Step 6: Final answer
    x = 8,748.27

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.