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Finding the Fourth Proportional to 31,406.40, 47,109.60 and 27,129.60

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Solution

The fourth proportional to 31,406.40, 47,109.60 and 27,129.60 is: 40,694.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,406.40 : 47,109.60 = 27,129.60 : x
  2. Step 2: Convert to fraction form
    31,406.40/47,109.60 = 27,129.60/x
  3. Step 3: Cross multiply
    31,406.40x = 47,109.60 × 27,129.60
  4. Step 4: Simplify right side
    31,406.40x = 1,278,064,604.16
  5. Step 5: Solve for x
    x = 1,278,064,604.16/31,406.40
  6. Step 6: Final answer
    x = 40,694.40

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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.