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Finding the Fourth Proportional to 103,639.90, 155,459.85 and 70,375.90

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Solution

The fourth proportional to 103,639.90, 155,459.85 and 70,375.90 is: 105,563.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.90 : 155,459.85 = 70,375.90 : x
  2. Step 2: Convert to fraction form
    103,639.90/155,459.85 = 70,375.90/x
  3. Step 3: Cross multiply
    103,639.90x = 155,459.85 × 70,375.90
  4. Step 4: Simplify right side
    103,639.90x = 10,940,626,857.62
  5. Step 5: Solve for x
    x = 10,940,626,857.62/103,639.90
  6. Step 6: Final answer
    x = 105,563.85

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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.