Home / 85,619.25-128,487.21-30,215.25

Finding the Fourth Proportional to 85,619.25, 128,487.21 and 30,215.25

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Solution

The fourth proportional to 85,619.25, 128,487.21 and 30,215.25 is: 45,343.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,619.25 : 128,487.21 = 30,215.25 : x
  2. Step 2: Convert to fraction form
    85,619.25/128,487.21 = 30,215.25/x
  3. Step 3: Cross multiply
    85,619.25x = 128,487.21 × 30,215.25
  4. Step 4: Simplify right side
    85,619.25x = 3,882,273,171.95
  5. Step 5: Solve for x
    x = 3,882,273,171.95/85,619.25
  6. Step 6: Final answer
    x = 45,343.46

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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.