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Finding the Fourth Proportional to 70,379.88, 105,422.94 and 42,210.60

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Solution

The fourth proportional to 70,379.88, 105,422.94 and 42,210.60 is: 63,227.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,379.88 : 105,422.94 = 42,210.60 : x
  2. Step 2: Convert to fraction form
    70,379.88/105,422.94 = 42,210.60/x
  3. Step 3: Cross multiply
    70,379.88x = 105,422.94 × 42,210.60
  4. Step 4: Simplify right side
    70,379.88x = 4,449,965,551.16
  5. Step 5: Solve for x
    x = 4,449,965,551.16/70,379.88
  6. Step 6: Final answer
    x = 63,227.81

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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.