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Finding the Fourth Proportional to 103,635.90, 155,453.85 and 70,371.90

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Solution

The fourth proportional to 103,635.90, 155,453.85 and 70,371.90 is: 105,557.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,635.90 : 155,453.85 = 70,371.90 : x
  2. Step 2: Convert to fraction form
    103,635.90/155,453.85 = 70,371.90/x
  3. Step 3: Cross multiply
    103,635.90x = 155,453.85 × 70,371.90
  4. Step 4: Simplify right side
    103,635.90x = 10,939,582,786.82
  5. Step 5: Solve for x
    x = 10,939,582,786.82/103,635.90
  6. Step 6: Final answer
    x = 105,557.85

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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.