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Finding the Fourth Proportional to 216,571.77, 324,639.50 and 90,281.88

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Solution

The fourth proportional to 216,571.77, 324,639.50 and 90,281.88 is: 135,331.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,571.77 : 324,639.50 = 90,281.88 : x
  2. Step 2: Convert to fraction form
    216,571.77/324,639.50 = 90,281.88/x
  3. Step 3: Cross multiply
    216,571.77x = 324,639.50 × 90,281.88
  4. Step 4: Simplify right side
    216,571.77x = 29,309,064,382.26
  5. Step 5: Solve for x
    x = 29,309,064,382.26/216,571.77
  6. Step 6: Final answer
    x = 135,331.88

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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.