Home / 31,720.57-43,754.58-20,404.81

Finding the Fourth Proportional to 31,720.57, 43,754.58 and 20,404.81

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Solution

The fourth proportional to 31,720.57, 43,754.58 and 20,404.81 is: 28,145.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,720.57 : 43,754.58 = 20,404.81 : x
  2. Step 2: Convert to fraction form
    31,720.57/43,754.58 = 20,404.81/x
  3. Step 3: Cross multiply
    31,720.57x = 43,754.58 × 20,404.81
  4. Step 4: Simplify right side
    31,720.57x = 892,803,946.22
  5. Step 5: Solve for x
    x = 892,803,946.22/31,720.57
  6. Step 6: Final answer
    x = 28,145.90

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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.