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Finding the Fourth Proportional to 399,642.98, 551,500.80 and 218,351

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Solution

The fourth proportional to 399,642.98, 551,500.80 and 218,351 is: 301,320.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,642.98 : 551,500.80 = 218,351 : x
  2. Step 2: Convert to fraction form
    399,642.98/551,500.80 = 218,351/x
  3. Step 3: Cross multiply
    399,642.98x = 551,500.80 × 218,351
  4. Step 4: Simplify right side
    399,642.98x = 120,420,751,180.80
  5. Step 5: Solve for x
    x = 120,420,751,180.80/399,642.98
  6. Step 6: Final answer
    x = 301,320.82

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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.