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Finding the Fourth Proportional to 162,421.20, 243,631.80 and 68,914.80

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Solution

The fourth proportional to 162,421.20, 243,631.80 and 68,914.80 is: 103,372.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    162,421.20 : 243,631.80 = 68,914.80 : x
  2. Step 2: Convert to fraction form
    162,421.20/243,631.80 = 68,914.80/x
  3. Step 3: Cross multiply
    162,421.20x = 243,631.80 × 68,914.80
  4. Step 4: Simplify right side
    162,421.20x = 16,789,836,770.64
  5. Step 5: Solve for x
    x = 16,789,836,770.64/162,421.20
  6. Step 6: Final answer
    x = 103,372.20

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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.