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Finding the Fourth Proportional to 399,775.43, 551,636.78 and 256,729.23

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Solution

The fourth proportional to 399,775.43, 551,636.78 and 256,729.23 is: 354,252.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,775.43 : 551,636.78 = 256,729.23 : x
  2. Step 2: Convert to fraction form
    399,775.43/551,636.78 = 256,729.23/x
  3. Step 3: Cross multiply
    399,775.43x = 551,636.78 × 256,729.23
  4. Step 4: Simplify right side
    399,775.43x = 141,621,284,485.43
  5. Step 5: Solve for x
    x = 141,621,284,485.43/399,775.43
  6. Step 6: Final answer
    x = 354,252.10

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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.