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Finding the Fourth Proportional to 103,620.80, 155,354.40 and 70,257.60

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Solution

The fourth proportional to 103,620.80, 155,354.40 and 70,257.60 is: 105,334.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,620.80 : 155,354.40 = 70,257.60 : x
  2. Step 2: Convert to fraction form
    103,620.80/155,354.40 = 70,257.60/x
  3. Step 3: Cross multiply
    103,620.80x = 155,354.40 × 70,257.60
  4. Step 4: Simplify right side
    103,620.80x = 10,914,827,293.44
  5. Step 5: Solve for x
    x = 10,914,827,293.44/103,620.80
  6. Step 6: Final answer
    x = 105,334.33

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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.