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Finding the Fourth Proportional to 388,260.78, 535,711.23 and 218,432.94

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Solution

The fourth proportional to 388,260.78, 535,711.23 and 218,432.94 is: 301,387.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,260.78 : 535,711.23 = 218,432.94 : x
  2. Step 2: Convert to fraction form
    388,260.78/535,711.23 = 218,432.94/x
  3. Step 3: Cross multiply
    388,260.78x = 535,711.23 × 218,432.94
  4. Step 4: Simplify right side
    388,260.78x = 117,016,978,959.92
  5. Step 5: Solve for x
    x = 117,016,978,959.92/388,260.78
  6. Step 6: Final answer
    x = 301,387.59

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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.