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Finding the Fourth Proportional to 388,485.68, 582,728.52 and 139,342.64

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Solution

The fourth proportional to 388,485.68, 582,728.52 and 139,342.64 is: 209,013.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,485.68 : 582,728.52 = 139,342.64 : x
  2. Step 2: Convert to fraction form
    388,485.68/582,728.52 = 139,342.64/x
  3. Step 3: Cross multiply
    388,485.68x = 582,728.52 × 139,342.64
  4. Step 4: Simplify right side
    388,485.68x = 81,198,930,380.09
  5. Step 5: Solve for x
    x = 81,198,930,380.09/388,485.68
  6. Step 6: Final answer
    x = 209,013.96

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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.