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Finding the Fourth Proportional to 99,861.78, 137,810.17 and 56,839.16

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Solution

The fourth proportional to 99,861.78, 137,810.17 and 56,839.16 is: 78,438.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,861.78 : 137,810.17 = 56,839.16 : x
  2. Step 2: Convert to fraction form
    99,861.78/137,810.17 = 56,839.16/x
  3. Step 3: Cross multiply
    99,861.78x = 137,810.17 × 56,839.16
  4. Step 4: Simplify right side
    99,861.78x = 7,833,014,302.26
  5. Step 5: Solve for x
    x = 7,833,014,302.26/99,861.78
  6. Step 6: Final answer
    x = 78,438.56

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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.