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Finding the Fourth Proportional to 388,130.61, 582,011.56 and 135,380.41

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Solution

The fourth proportional to 388,130.61, 582,011.56 and 135,380.41 is: 203,006.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,130.61 : 582,011.56 = 135,380.41 : x
  2. Step 2: Convert to fraction form
    388,130.61/582,011.56 = 135,380.41/x
  3. Step 3: Cross multiply
    388,130.61x = 582,011.56 × 135,380.41
  4. Step 4: Simplify right side
    388,130.61x = 78,792,963,617.54
  5. Step 5: Solve for x
    x = 78,792,963,617.54/388,130.61
  6. Step 6: Final answer
    x = 203,006.31

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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.