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Finding the Fourth Proportional to 66,770.92, 92,143.70 and 39,912.12

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Solution

The fourth proportional to 66,770.92, 92,143.70 and 39,912.12 is: 55,078.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,770.92 : 92,143.70 = 39,912.12 : x
  2. Step 2: Convert to fraction form
    66,770.92/92,143.70 = 39,912.12/x
  3. Step 3: Cross multiply
    66,770.92x = 92,143.70 × 39,912.12
  4. Step 4: Simplify right side
    66,770.92x = 3,677,650,411.64
  5. Step 5: Solve for x
    x = 3,677,650,411.64/66,770.92
  6. Step 6: Final answer
    x = 55,078.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.