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Finding the Fourth Proportional to 39,879.40, 59,819.10 and 31,066.60

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Solution

The fourth proportional to 39,879.40, 59,819.10 and 31,066.60 is: 46,599.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,879.40 : 59,819.10 = 31,066.60 : x
  2. Step 2: Convert to fraction form
    39,879.40/59,819.10 = 31,066.60/x
  3. Step 3: Cross multiply
    39,879.40x = 59,819.10 × 31,066.60
  4. Step 4: Simplify right side
    39,879.40x = 1,858,376,052.06
  5. Step 5: Solve for x
    x = 1,858,376,052.06/39,879.40
  6. Step 6: Final answer
    x = 46,599.90

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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.