Home / 89,750.12-123,782.46-78,971.72

Finding the Fourth Proportional to 89,750.12, 123,782.46 and 78,971.72

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Solution

The fourth proportional to 89,750.12, 123,782.46 and 78,971.72 is: 108,917.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,750.12 : 123,782.46 = 78,971.72 : x
  2. Step 2: Convert to fraction form
    89,750.12/123,782.46 = 78,971.72/x
  3. Step 3: Cross multiply
    89,750.12x = 123,782.46 × 78,971.72
  4. Step 4: Simplify right side
    89,750.12x = 9,775,313,772.03
  5. Step 5: Solve for x
    x = 9,775,313,772.03/89,750.12
  6. Step 6: Final answer
    x = 108,917.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.