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Finding the Fourth Proportional to 103,960.62, 155,861.64 and 86,136.57

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Solution

The fourth proportional to 103,960.62, 155,861.64 and 86,136.57 is: 129,139.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,960.62 : 155,861.64 = 86,136.57 : x
  2. Step 2: Convert to fraction form
    103,960.62/155,861.64 = 86,136.57/x
  3. Step 3: Cross multiply
    103,960.62x = 155,861.64 × 86,136.57
  4. Step 4: Simplify right side
    103,960.62x = 13,425,387,064.17
  5. Step 5: Solve for x
    x = 13,425,387,064.17/103,960.62
  6. Step 6: Final answer
    x = 129,139.16

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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.