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Finding the Fourth Proportional to 31,709.60, 47,560.80 and 8,338.40

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Solution

The fourth proportional to 31,709.60, 47,560.80 and 8,338.40 is: 12,506.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,709.60 : 47,560.80 = 8,338.40 : x
  2. Step 2: Convert to fraction form
    31,709.60/47,560.80 = 8,338.40/x
  3. Step 3: Cross multiply
    31,709.60x = 47,560.80 × 8,338.40
  4. Step 4: Simplify right side
    31,709.60x = 396,580,974.72
  5. Step 5: Solve for x
    x = 396,580,974.72/31,709.60
  6. Step 6: Final answer
    x = 12,506.65

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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.