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Finding the Fourth Proportional to 120,965.40, 181,448.10 and 91,440.90

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Solution

The fourth proportional to 120,965.40, 181,448.10 and 91,440.90 is: 137,161.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,965.40 : 181,448.10 = 91,440.90 : x
  2. Step 2: Convert to fraction form
    120,965.40/181,448.10 = 91,440.90/x
  3. Step 3: Cross multiply
    120,965.40x = 181,448.10 × 91,440.90
  4. Step 4: Simplify right side
    120,965.40x = 16,591,777,567.29
  5. Step 5: Solve for x
    x = 16,591,777,567.29/120,965.40
  6. Step 6: Final answer
    x = 137,161.35

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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.