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Finding the Fourth Proportional to 107,819.80, 161,729.70 and 68,421.40

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Solution

The fourth proportional to 107,819.80, 161,729.70 and 68,421.40 is: 102,632.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,819.80 : 161,729.70 = 68,421.40 : x
  2. Step 2: Convert to fraction form
    107,819.80/161,729.70 = 68,421.40/x
  3. Step 3: Cross multiply
    107,819.80x = 161,729.70 × 68,421.40
  4. Step 4: Simplify right side
    107,819.80x = 11,065,772,495.58
  5. Step 5: Solve for x
    x = 11,065,772,495.58/107,819.80
  6. Step 6: Final answer
    x = 102,632.10

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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.