Home / 109,981.20-164,971.80-100,139.70

Finding the Fourth Proportional to 109,981.20, 164,971.80 and 100,139.70

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Solution

The fourth proportional to 109,981.20, 164,971.80 and 100,139.70 is: 150,209.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,981.20 : 164,971.80 = 100,139.70 : x
  2. Step 2: Convert to fraction form
    109,981.20/164,971.80 = 100,139.70/x
  3. Step 3: Cross multiply
    109,981.20x = 164,971.80 × 100,139.70
  4. Step 4: Simplify right side
    109,981.20x = 16,520,226,560.46
  5. Step 5: Solve for x
    x = 16,520,226,560.46/109,981.20
  6. Step 6: Final answer
    x = 150,209.55

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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.