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Finding the Fourth Proportional to 628,163.71, 867,019.88 and 356,390.69

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Solution

The fourth proportional to 628,163.71, 867,019.88 and 356,390.69 is: 491,906.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,163.71 : 867,019.88 = 356,390.69 : x
  2. Step 2: Convert to fraction form
    628,163.71/867,019.88 = 356,390.69/x
  3. Step 3: Cross multiply
    628,163.71x = 867,019.88 × 356,390.69
  4. Step 4: Simplify right side
    628,163.71x = 308,997,809,832.80
  5. Step 5: Solve for x
    x = 308,997,809,832.80/628,163.71
  6. Step 6: Final answer
    x = 491,906.50

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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.