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Finding the Fourth Proportional to 85,736.40, 128,385.90 and 68,240.40

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Solution

The fourth proportional to 85,736.40, 128,385.90 and 68,240.40 is: 102,186.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,736.40 : 128,385.90 = 68,240.40 : x
  2. Step 2: Convert to fraction form
    85,736.40/128,385.90 = 68,240.40/x
  3. Step 3: Cross multiply
    85,736.40x = 128,385.90 × 68,240.40
  4. Step 4: Simplify right side
    85,736.40x = 8,761,105,170.36
  5. Step 5: Solve for x
    x = 8,761,105,170.36/85,736.40
  6. Step 6: Final answer
    x = 102,186.53

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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.