Home / 85,229.12-128,028-72,107.84

Finding the Fourth Proportional to 85,229.12, 128,028 and 72,107.84

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Solution

The fourth proportional to 85,229.12, 128,028 and 72,107.84 is: 108,317.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,229.12 : 128,028 = 72,107.84 : x
  2. Step 2: Convert to fraction form
    85,229.12/128,028 = 72,107.84/x
  3. Step 3: Cross multiply
    85,229.12x = 128,028 × 72,107.84
  4. Step 4: Simplify right side
    85,229.12x = 9,231,822,539.52
  5. Step 5: Solve for x
    x = 9,231,822,539.52/85,229.12
  6. Step 6: Final answer
    x = 108,317.70

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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.