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Finding the Fourth Proportional to 667,442.50, 921,136.74 and 381,005.68

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Solution

The fourth proportional to 667,442.50, 921,136.74 and 381,005.68 is: 525,825.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,442.50 : 921,136.74 = 381,005.68 : x
  2. Step 2: Convert to fraction form
    667,442.50/921,136.74 = 381,005.68/x
  3. Step 3: Cross multiply
    667,442.50x = 921,136.74 × 381,005.68
  4. Step 4: Simplify right side
    667,442.50x = 350,958,329,996.68
  5. Step 5: Solve for x
    x = 350,958,329,996.68/667,442.50
  6. Step 6: Final answer
    x = 525,825.57

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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.