Home / 21,128.32-31,723.62-11,786.59

Finding the Fourth Proportional to 21,128.32, 31,723.62 and 11,786.59

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Solution

The fourth proportional to 21,128.32, 31,723.62 and 11,786.59 is: 17,697.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.32 : 31,723.62 = 11,786.59 : x
  2. Step 2: Convert to fraction form
    21,128.32/31,723.62 = 11,786.59/x
  3. Step 3: Cross multiply
    21,128.32x = 31,723.62 × 11,786.59
  4. Step 4: Simplify right side
    21,128.32x = 373,913,143.64
  5. Step 5: Solve for x
    x = 373,913,143.64/21,128.32
  6. Step 6: Final answer
    x = 17,697.25

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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.