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Finding the Fourth Proportional to 620,468.94, 856,339.70 and 378,891.54

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Solution

The fourth proportional to 620,468.94, 856,339.70 and 378,891.54 is: 522,926.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,468.94 : 856,339.70 = 378,891.54 : x
  2. Step 2: Convert to fraction form
    620,468.94/856,339.70 = 378,891.54/x
  3. Step 3: Cross multiply
    620,468.94x = 856,339.70 × 378,891.54
  4. Step 4: Simplify right side
    620,468.94x = 324,459,867,696.14
  5. Step 5: Solve for x
    x = 324,459,867,696.14/620,468.94
  6. Step 6: Final answer
    x = 522,926.85

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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.