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Finding the Fourth Proportional to 667,379.72, 921,031.26 and 380,942.87

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Solution

The fourth proportional to 667,379.72, 921,031.26 and 380,942.87 is: 525,728.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,379.72 : 921,031.26 = 380,942.87 : x
  2. Step 2: Convert to fraction form
    667,379.72/921,031.26 = 380,942.87/x
  3. Step 3: Cross multiply
    667,379.72x = 921,031.26 × 380,942.87
  4. Step 4: Simplify right side
    667,379.72x = 350,860,285,510.42
  5. Step 5: Solve for x
    x = 350,860,285,510.42/667,379.72
  6. Step 6: Final answer
    x = 525,728.12

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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.