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Finding the Fourth Proportional to 137,811.80, 206,717.70 and 120,315.80

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Solution

The fourth proportional to 137,811.80, 206,717.70 and 120,315.80 is: 180,473.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,811.80 : 206,717.70 = 120,315.80 : x
  2. Step 2: Convert to fraction form
    137,811.80/206,717.70 = 120,315.80/x
  3. Step 3: Cross multiply
    137,811.80x = 206,717.70 × 120,315.80
  4. Step 4: Simplify right side
    137,811.80x = 24,871,405,449.66
  5. Step 5: Solve for x
    x = 24,871,405,449.66/137,811.80
  6. Step 6: Final answer
    x = 180,473.70

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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.