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Finding the Fourth Proportional to 620,231.95, 856,012.66 and 378,654.56

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Solution

The fourth proportional to 620,231.95, 856,012.66 and 378,654.56 is: 522,599.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,231.95 : 856,012.66 = 378,654.56 : x
  2. Step 2: Convert to fraction form
    620,231.95/856,012.66 = 378,654.56/x
  3. Step 3: Cross multiply
    620,231.95x = 856,012.66 × 378,654.56
  4. Step 4: Simplify right side
    620,231.95x = 324,133,099,925.15
  5. Step 5: Solve for x
    x = 324,133,099,925.15/620,231.95
  6. Step 6: Final answer
    x = 522,599.81

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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.