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Finding the Fourth Proportional to 399,499.60, 551,305.80 and 218,211.48

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Solution

The fourth proportional to 399,499.60, 551,305.80 and 218,211.48 is: 301,129.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,499.60 : 551,305.80 = 218,211.48 : x
  2. Step 2: Convert to fraction form
    399,499.60/551,305.80 = 218,211.48/x
  3. Step 3: Cross multiply
    399,499.60x = 551,305.80 × 218,211.48
  4. Step 4: Simplify right side
    399,499.60x = 120,301,254,550.58
  5. Step 5: Solve for x
    x = 120,301,254,550.58/399,499.60
  6. Step 6: Final answer
    x = 301,129.85

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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.