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Finding the Fourth Proportional to 642,136.59, 886,154.96 and 387,438.57

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Solution

The fourth proportional to 642,136.59, 886,154.96 and 387,438.57 is: 534,669.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,136.59 : 886,154.96 = 387,438.57 : x
  2. Step 2: Convert to fraction form
    642,136.59/886,154.96 = 387,438.57/x
  3. Step 3: Cross multiply
    642,136.59x = 886,154.96 × 387,438.57
  4. Step 4: Simplify right side
    642,136.59x = 343,330,611,469.40
  5. Step 5: Solve for x
    x = 343,330,611,469.40/642,136.59
  6. Step 6: Final answer
    x = 534,669.13

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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.