Home / 21,108.87-31,651.59-8,637.64

Finding the Fourth Proportional to 21,108.87, 31,651.59 and 8,637.64

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Solution

The fourth proportional to 21,108.87, 31,651.59 and 8,637.64 is: 12,951.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.87 : 31,651.59 = 8,637.64 : x
  2. Step 2: Convert to fraction form
    21,108.87/31,651.59 = 8,637.64/x
  3. Step 3: Cross multiply
    21,108.87x = 31,651.59 × 8,637.64
  4. Step 4: Simplify right side
    21,108.87x = 273,395,039.85
  5. Step 5: Solve for x
    x = 273,395,039.85/21,108.87
  6. Step 6: Final answer
    x = 12,951.67

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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.