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Finding the Fourth Proportional to 717,333, 989,919.54 and 399,381

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Solution

The fourth proportional to 717,333, 989,919.54 and 399,381 is: 551,145.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,333 : 989,919.54 = 399,381 : x
  2. Step 2: Convert to fraction form
    717,333/989,919.54 = 399,381/x
  3. Step 3: Cross multiply
    717,333x = 989,919.54 × 399,381
  4. Step 4: Simplify right side
    717,333x = 395,355,055,804.74
  5. Step 5: Solve for x
    x = 395,355,055,804.74/717,333
  6. Step 6: Final answer
    x = 551,145.78

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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.