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Finding the Fourth Proportional to 644,770.62, 889,523.64 and 389,678.94

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Solution

The fourth proportional to 644,770.62, 889,523.64 and 389,678.94 is: 537,599.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,770.62 : 889,523.64 = 389,678.94 : x
  2. Step 2: Convert to fraction form
    644,770.62/889,523.64 = 389,678.94/x
  3. Step 3: Cross multiply
    644,770.62x = 889,523.64 × 389,678.94
  4. Step 4: Simplify right side
    644,770.62x = 346,628,629,140.14
  5. Step 5: Solve for x
    x = 346,628,629,140.14/644,770.62
  6. Step 6: Final answer
    x = 537,599.91

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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.