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Finding the Fourth Proportional to 399,978.84, 551,979.45 and 238,803.83

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Solution

The fourth proportional to 399,978.84, 551,979.45 and 238,803.83 is: 329,554.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,978.84 : 551,979.45 = 238,803.83 : x
  2. Step 2: Convert to fraction form
    399,978.84/551,979.45 = 238,803.83/x
  3. Step 3: Cross multiply
    399,978.84x = 551,979.45 × 238,803.83
  4. Step 4: Simplify right side
    399,978.84x = 131,814,802,787.38
  5. Step 5: Solve for x
    x = 131,814,802,787.38/399,978.84
  6. Step 6: Final answer
    x = 329,554.44

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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.