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Finding the Fourth Proportional to 71,136.63, 106,712.03 and 21,207.89

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Solution

The fourth proportional to 71,136.63, 106,712.03 and 21,207.89 is: 31,813.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,136.63 : 106,712.03 = 21,207.89 : x
  2. Step 2: Convert to fraction form
    71,136.63/106,712.03 = 21,207.89/x
  3. Step 3: Cross multiply
    71,136.63x = 106,712.03 × 21,207.89
  4. Step 4: Simplify right side
    71,136.63x = 2,263,137,313.72
  5. Step 5: Solve for x
    x = 2,263,137,313.72/71,136.63
  6. Step 6: Final answer
    x = 31,813.95

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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.