Home / 31,379.79-47,078.90-12,650.21

Finding the Fourth Proportional to 31,379.79, 47,078.90 and 12,650.21

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Solution

The fourth proportional to 31,379.79, 47,078.90 and 12,650.21 is: 18,979.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,379.79 : 47,078.90 = 12,650.21 : x
  2. Step 2: Convert to fraction form
    31,379.79/47,078.90 = 12,650.21/x
  3. Step 3: Cross multiply
    31,379.79x = 47,078.90 × 12,650.21
  4. Step 4: Simplify right side
    31,379.79x = 595,557,672.92
  5. Step 5: Solve for x
    x = 595,557,672.92/31,379.79
  6. Step 6: Final answer
    x = 18,979.02

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1.5x scale

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.