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Finding the Fourth Proportional to 388,976, 536,787.36 and 210,128

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Solution

The fourth proportional to 388,976, 536,787.36 and 210,128 is: 289,976.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,976 : 536,787.36 = 210,128 : x
  2. Step 2: Convert to fraction form
    388,976/536,787.36 = 210,128/x
  3. Step 3: Cross multiply
    388,976x = 536,787.36 × 210,128
  4. Step 4: Simplify right side
    388,976x = 112,794,054,382.08
  5. Step 5: Solve for x
    x = 112,794,054,382.08/388,976
  6. Step 6: Final answer
    x = 289,976.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.