Home / 45,435.12-68,129.64-20,790

Finding the Fourth Proportional to 45,435.12, 68,129.64 and 20,790

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Solution

The fourth proportional to 45,435.12, 68,129.64 and 20,790 is: 31,174.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,435.12 : 68,129.64 = 20,790 : x
  2. Step 2: Convert to fraction form
    45,435.12/68,129.64 = 20,790/x
  3. Step 3: Cross multiply
    45,435.12x = 68,129.64 × 20,790
  4. Step 4: Simplify right side
    45,435.12x = 1,416,415,215.60
  5. Step 5: Solve for x
    x = 1,416,415,215.60/45,435.12
  6. Step 6: Final answer
    x = 31,174.46

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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.