Home / 109,819.60-164,729.40-72,421.90

Finding the Fourth Proportional to 109,819.60, 164,729.40 and 72,421.90

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Solution

The fourth proportional to 109,819.60, 164,729.40 and 72,421.90 is: 108,632.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,819.60 : 164,729.40 = 72,421.90 : x
  2. Step 2: Convert to fraction form
    109,819.60/164,729.40 = 72,421.90/x
  3. Step 3: Cross multiply
    109,819.60x = 164,729.40 × 72,421.90
  4. Step 4: Simplify right side
    109,819.60x = 11,930,016,133.86
  5. Step 5: Solve for x
    x = 11,930,016,133.86/109,819.60
  6. Step 6: Final answer
    x = 108,632.85

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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.