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Finding the Fourth Proportional to 388,516.98, 582,879.15 and 139,224.18

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Solution

The fourth proportional to 388,516.98, 582,879.15 and 139,224.18 is: 208,873.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,516.98 : 582,879.15 = 139,224.18 : x
  2. Step 2: Convert to fraction form
    388,516.98/582,879.15 = 139,224.18/x
  3. Step 3: Cross multiply
    388,516.98x = 582,879.15 × 139,224.18
  4. Step 4: Simplify right side
    388,516.98x = 81,150,871,697.85
  5. Step 5: Solve for x
    x = 81,150,871,697.85/388,516.98
  6. Step 6: Final answer
    x = 208,873.42

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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.