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Finding the Fourth Proportional to 81,253.53, 121,776.21 and 70,679.25

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Solution

The fourth proportional to 81,253.53, 121,776.21 and 70,679.25 is: 105,928.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,253.53 : 121,776.21 = 70,679.25 : x
  2. Step 2: Convert to fraction form
    81,253.53/121,776.21 = 70,679.25/x
  3. Step 3: Cross multiply
    81,253.53x = 121,776.21 × 70,679.25
  4. Step 4: Simplify right side
    81,253.53x = 8,607,051,190.64
  5. Step 5: Solve for x
    x = 8,607,051,190.64/81,253.53
  6. Step 6: Final answer
    x = 105,928.34

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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.