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Finding the Fourth Proportional to 399,627.76, 551,470 and 218,346

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Solution

The fourth proportional to 399,627.76, 551,470 and 218,346 is: 301,308.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,627.76 : 551,470 = 218,346 : x
  2. Step 2: Convert to fraction form
    399,627.76/551,470 = 218,346/x
  3. Step 3: Cross multiply
    399,627.76x = 551,470 × 218,346
  4. Step 4: Simplify right side
    399,627.76x = 120,411,268,620
  5. Step 5: Solve for x
    x = 120,411,268,620/399,627.76
  6. Step 6: Final answer
    x = 301,308.57

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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.