Home / 21,221.46-31,813.43-18,121.32

Finding the Fourth Proportional to 21,221.46, 31,813.43 and 18,121.32

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Solution

The fourth proportional to 21,221.46, 31,813.43 and 18,121.32 is: 27,165.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,221.46 : 31,813.43 = 18,121.32 : x
  2. Step 2: Convert to fraction form
    21,221.46/31,813.43 = 18,121.32/x
  3. Step 3: Cross multiply
    21,221.46x = 31,813.43 × 18,121.32
  4. Step 4: Simplify right side
    21,221.46x = 576,501,254.72
  5. Step 5: Solve for x
    x = 576,501,254.72/21,221.46
  6. Step 6: Final answer
    x = 27,165.96

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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.