Home / 107,956.20-161,934.30-85,405.80

Finding the Fourth Proportional to 107,956.20, 161,934.30 and 85,405.80

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Solution

The fourth proportional to 107,956.20, 161,934.30 and 85,405.80 is: 128,108.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,956.20 : 161,934.30 = 85,405.80 : x
  2. Step 2: Convert to fraction form
    107,956.20/161,934.30 = 85,405.80/x
  3. Step 3: Cross multiply
    107,956.20x = 161,934.30 × 85,405.80
  4. Step 4: Simplify right side
    107,956.20x = 13,830,128,438.94
  5. Step 5: Solve for x
    x = 13,830,128,438.94/107,956.20
  6. Step 6: Final answer
    x = 128,108.70

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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.