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Finding the Fourth Proportional to 85,640.40, 128,460.60 and 82,141.20

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Solution

The fourth proportional to 85,640.40, 128,460.60 and 82,141.20 is: 123,211.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,640.40 : 128,460.60 = 82,141.20 : x
  2. Step 2: Convert to fraction form
    85,640.40/128,460.60 = 82,141.20/x
  3. Step 3: Cross multiply
    85,640.40x = 128,460.60 × 82,141.20
  4. Step 4: Simplify right side
    85,640.40x = 10,551,907,836.72
  5. Step 5: Solve for x
    x = 10,551,907,836.72/85,640.40
  6. Step 6: Final answer
    x = 123,211.80

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1.5x scale

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.