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Finding the Fourth Proportional to 71,092.80, 106,639.20 and 66,715.20

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Solution

The fourth proportional to 71,092.80, 106,639.20 and 66,715.20 is: 100,072.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,092.80 : 106,639.20 = 66,715.20 : x
  2. Step 2: Convert to fraction form
    71,092.80/106,639.20 = 66,715.20/x
  3. Step 3: Cross multiply
    71,092.80x = 106,639.20 × 66,715.20
  4. Step 4: Simplify right side
    71,092.80x = 7,114,455,555.84
  5. Step 5: Solve for x
    x = 7,114,455,555.84/71,092.80
  6. Step 6: Final answer
    x = 100,072.80

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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.