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Finding the Fourth Proportional to 71,709.70, 107,528.10 and 42,136.60

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Solution

The fourth proportional to 71,709.70, 107,528.10 and 42,136.60 is: 63,183.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,709.70 : 107,528.10 = 42,136.60 : x
  2. Step 2: Convert to fraction form
    71,709.70/107,528.10 = 42,136.60/x
  3. Step 3: Cross multiply
    71,709.70x = 107,528.10 × 42,136.60
  4. Step 4: Simplify right side
    71,709.70x = 4,530,868,538.46
  5. Step 5: Solve for x
    x = 4,530,868,538.46/71,709.70
  6. Step 6: Final answer
    x = 63,183.48

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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.