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Finding the Fourth Proportional to 65,880.21, 90,828.90 and 41,998.17

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Solution

The fourth proportional to 65,880.21, 90,828.90 and 41,998.17 is: 57,902.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,880.21 : 90,828.90 = 41,998.17 : x
  2. Step 2: Convert to fraction form
    65,880.21/90,828.90 = 41,998.17/x
  3. Step 3: Cross multiply
    65,880.21x = 90,828.90 × 41,998.17
  4. Step 4: Simplify right side
    65,880.21x = 3,814,647,583.11
  5. Step 5: Solve for x
    x = 3,814,647,583.11/65,880.21
  6. Step 6: Final answer
    x = 57,902.78

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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.