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Finding the Fourth Proportional to 208,136.40, 312,127.80 and 67,899.60

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Solution

The fourth proportional to 208,136.40, 312,127.80 and 67,899.60 is: 101,824.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,136.40 : 312,127.80 = 67,899.60 : x
  2. Step 2: Convert to fraction form
    208,136.40/312,127.80 = 67,899.60/x
  3. Step 3: Cross multiply
    208,136.40x = 312,127.80 × 67,899.60
  4. Step 4: Simplify right side
    208,136.40x = 21,193,352,768.88
  5. Step 5: Solve for x
    x = 21,193,352,768.88/208,136.40
  6. Step 6: Final answer
    x = 101,824.35

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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.