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Finding the Fourth Proportional to 40,640.80, 60,941.04 and 12,935.20

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Solution

The fourth proportional to 40,640.80, 60,941.04 and 12,935.20 is: 19,396.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,640.80 : 60,941.04 = 12,935.20 : x
  2. Step 2: Convert to fraction form
    40,640.80/60,941.04 = 12,935.20/x
  3. Step 3: Cross multiply
    40,640.80x = 60,941.04 × 12,935.20
  4. Step 4: Simplify right side
    40,640.80x = 788,284,540.61
  5. Step 5: Solve for x
    x = 788,284,540.61/40,640.80
  6. Step 6: Final answer
    x = 19,396.38

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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.