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Finding the Fourth Proportional to 66,637.80, 91,961.10 and 39,792.60

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Solution

The fourth proportional to 66,637.80, 91,961.10 and 39,792.60 is: 54,914.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,637.80 : 91,961.10 = 39,792.60 : x
  2. Step 2: Convert to fraction form
    66,637.80/91,961.10 = 39,792.60/x
  3. Step 3: Cross multiply
    66,637.80x = 91,961.10 × 39,792.60
  4. Step 4: Simplify right side
    66,637.80x = 3,659,371,267.86
  5. Step 5: Solve for x
    x = 3,659,371,267.86/66,637.80
  6. Step 6: Final answer
    x = 54,914.35

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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.