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Finding the Fourth Proportional to 80,885.80, 121,328.70 and 51,361.30

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Solution

The fourth proportional to 80,885.80, 121,328.70 and 51,361.30 is: 77,041.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,885.80 : 121,328.70 = 51,361.30 : x
  2. Step 2: Convert to fraction form
    80,885.80/121,328.70 = 51,361.30/x
  3. Step 3: Cross multiply
    80,885.80x = 121,328.70 × 51,361.30
  4. Step 4: Simplify right side
    80,885.80x = 6,231,599,759.31
  5. Step 5: Solve for x
    x = 6,231,599,759.31/80,885.80
  6. Step 6: Final answer
    x = 77,041.95

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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.