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Finding the Fourth Proportional to 388,431.45, 536,034.51 and 218,665.98

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Solution

The fourth proportional to 388,431.45, 536,034.51 and 218,665.98 is: 301,758.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,431.45 : 536,034.51 = 218,665.98 : x
  2. Step 2: Convert to fraction form
    388,431.45/536,034.51 = 218,665.98/x
  3. Step 3: Cross multiply
    388,431.45x = 536,034.51 × 218,665.98
  4. Step 4: Simplify right side
    388,431.45x = 117,212,511,442.97
  5. Step 5: Solve for x
    x = 117,212,511,442.97/388,431.45
  6. Step 6: Final answer
    x = 301,758.55

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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.