Home / 31,715.11-43,747.05-20,399.35

Finding the Fourth Proportional to 31,715.11, 43,747.05 and 20,399.35

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Solution

The fourth proportional to 31,715.11, 43,747.05 and 20,399.35 is: 28,138.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,715.11 : 43,747.05 = 20,399.35 : x
  2. Step 2: Convert to fraction form
    31,715.11/43,747.05 = 20,399.35/x
  3. Step 3: Cross multiply
    31,715.11x = 43,747.05 × 20,399.35
  4. Step 4: Simplify right side
    31,715.11x = 892,411,384.42
  5. Step 5: Solve for x
    x = 892,411,384.42/31,715.11
  6. Step 6: Final answer
    x = 28,138.37

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1.5x scale

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.