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Finding the Fourth Proportional to 689,930.31, 951,990.93 and 399,438.39

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Solution

The fourth proportional to 689,930.31, 951,990.93 and 399,438.39 is: 551,159.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,930.31 : 951,990.93 = 399,438.39 : x
  2. Step 2: Convert to fraction form
    689,930.31/951,990.93 = 399,438.39/x
  3. Step 3: Cross multiply
    689,930.31x = 951,990.93 × 399,438.39
  4. Step 4: Simplify right side
    689,930.31x = 380,261,724,373.80
  5. Step 5: Solve for x
    x = 380,261,724,373.80/689,930.31
  6. Step 6: Final answer
    x = 551,159.62

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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.