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Finding the Fourth Proportional to 667,687.40, 999,687.90 and 520,231.40

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Solution

The fourth proportional to 667,687.40, 999,687.90 and 520,231.40 is: 778,910.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,687.40 : 999,687.90 = 520,231.40 : x
  2. Step 2: Convert to fraction form
    667,687.40/999,687.90 = 520,231.40/x
  3. Step 3: Cross multiply
    667,687.40x = 999,687.90 × 520,231.40
  4. Step 4: Simplify right side
    667,687.40x = 520,069,035,780.06
  5. Step 5: Solve for x
    x = 520,069,035,780.06/667,687.40
  6. Step 6: Final answer
    x = 778,910.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.