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Finding the Fourth Proportional to 399,346.82, 551,121.06 and 218,075.60

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Solution

The fourth proportional to 399,346.82, 551,121.06 and 218,075.60 is: 300,956.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,346.82 : 551,121.06 = 218,075.60 : x
  2. Step 2: Convert to fraction form
    399,346.82/551,121.06 = 218,075.60/x
  3. Step 3: Cross multiply
    399,346.82x = 551,121.06 × 218,075.60
  4. Step 4: Simplify right side
    399,346.82x = 120,186,055,832.14
  5. Step 5: Solve for x
    x = 120,186,055,832.14/399,346.82
  6. Step 6: Final answer
    x = 300,956.59

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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.