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Finding the Fourth Proportional to 644,238.21, 888,905.56 and 389,583.93

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Solution

The fourth proportional to 644,238.21, 888,905.56 and 389,583.93 is: 537,539.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,238.21 : 888,905.56 = 389,583.93 : x
  2. Step 2: Convert to fraction form
    644,238.21/888,905.56 = 389,583.93/x
  3. Step 3: Cross multiply
    644,238.21x = 888,905.56 × 389,583.93
  4. Step 4: Simplify right side
    644,238.21x = 346,303,321,463.65
  5. Step 5: Solve for x
    x = 346,303,321,463.65/644,238.21
  6. Step 6: Final answer
    x = 537,539.25

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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.