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Finding the Fourth Proportional to 667,705.70, 921,432.56 and 361,790.35

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Solution

The fourth proportional to 667,705.70, 921,432.56 and 361,790.35 is: 499,269.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,705.70 : 921,432.56 = 361,790.35 : x
  2. Step 2: Convert to fraction form
    667,705.70/921,432.56 = 361,790.35/x
  3. Step 3: Cross multiply
    667,705.70x = 921,432.56 × 361,790.35
  4. Step 4: Simplify right side
    667,705.70x = 333,365,401,967.68
  5. Step 5: Solve for x
    x = 333,365,401,967.68/667,705.70
  6. Step 6: Final answer
    x = 499,269.97

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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.