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Finding the Fourth Proportional to 103,878.20, 155,890.20 and 66,529.10

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Solution

The fourth proportional to 103,878.20, 155,890.20 and 66,529.10 is: 99,840.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,878.20 : 155,890.20 = 66,529.10 : x
  2. Step 2: Convert to fraction form
    103,878.20/155,890.20 = 66,529.10/x
  3. Step 3: Cross multiply
    103,878.20x = 155,890.20 × 66,529.10
  4. Step 4: Simplify right side
    103,878.20x = 10,371,234,704.82
  5. Step 5: Solve for x
    x = 10,371,234,704.82/103,878.20
  6. Step 6: Final answer
    x = 99,840.34

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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.