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Finding the Fourth Proportional to 85,912.70, 128,759.70 and 76,508.60

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Solution

The fourth proportional to 85,912.70, 128,759.70 and 76,508.60 is: 114,665.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,912.70 : 128,759.70 = 76,508.60 : x
  2. Step 2: Convert to fraction form
    85,912.70/128,759.70 = 76,508.60/x
  3. Step 3: Cross multiply
    85,912.70x = 128,759.70 × 76,508.60
  4. Step 4: Simplify right side
    85,912.70x = 9,851,224,383.42
  5. Step 5: Solve for x
    x = 9,851,224,383.42/85,912.70
  6. Step 6: Final answer
    x = 114,665.52

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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.