Home / 80,921.21-121,056.57-69,945.71

Finding the Fourth Proportional to 80,921.21, 121,056.57 and 69,945.71

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Solution

The fourth proportional to 80,921.21, 121,056.57 and 69,945.71 is: 104,637.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,921.21 : 121,056.57 = 69,945.71 : x
  2. Step 2: Convert to fraction form
    80,921.21/121,056.57 = 69,945.71/x
  3. Step 3: Cross multiply
    80,921.21x = 121,056.57 × 69,945.71
  4. Step 4: Simplify right side
    80,921.21x = 8,467,387,133.53
  5. Step 5: Solve for x
    x = 8,467,387,133.53/80,921.21
  6. Step 6: Final answer
    x = 104,637.43

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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.