Home / 85,836.10-128,754.15-72,876.10

Finding the Fourth Proportional to 85,836.10, 128,754.15 and 72,876.10

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Solution

The fourth proportional to 85,836.10, 128,754.15 and 72,876.10 is: 109,314.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,836.10 : 128,754.15 = 72,876.10 : x
  2. Step 2: Convert to fraction form
    85,836.10/128,754.15 = 72,876.10/x
  3. Step 3: Cross multiply
    85,836.10x = 128,754.15 × 72,876.10
  4. Step 4: Simplify right side
    85,836.10x = 9,383,100,310.82
  5. Step 5: Solve for x
    x = 9,383,100,310.82/85,836.10
  6. Step 6: Final answer
    x = 109,314.15

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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.