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Finding the Fourth Proportional to 399,646.45, 551,495.69 and 218,364.60

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Solution

The fourth proportional to 399,646.45, 551,495.69 and 218,364.60 is: 301,334.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,646.45 : 551,495.69 = 218,364.60 : x
  2. Step 2: Convert to fraction form
    399,646.45/551,495.69 = 218,364.60/x
  3. Step 3: Cross multiply
    399,646.45x = 551,495.69 × 218,364.60
  4. Step 4: Simplify right side
    399,646.45x = 120,427,135,748.57
  5. Step 5: Solve for x
    x = 120,427,135,748.57/399,646.45
  6. Step 6: Final answer
    x = 301,334.18

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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.