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Finding the Fourth Proportional to 112,640.40, 155,441.40 and 61,651.92

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Solution

The fourth proportional to 112,640.40, 155,441.40 and 61,651.92 is: 85,078.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,640.40 : 155,441.40 = 61,651.92 : x
  2. Step 2: Convert to fraction form
    112,640.40/155,441.40 = 61,651.92/x
  3. Step 3: Cross multiply
    112,640.40x = 155,441.40 × 61,651.92
  4. Step 4: Simplify right side
    112,640.40x = 9,583,260,757.49
  5. Step 5: Solve for x
    x = 9,583,260,757.49/112,640.40
  6. Step 6: Final answer
    x = 85,078.36

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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.