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Finding the Fourth Proportional to 85,672.37, 128,520.84 and 26,512.67

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Solution

The fourth proportional to 85,672.37, 128,520.84 and 26,512.67 is: 39,772.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,672.37 : 128,520.84 = 26,512.67 : x
  2. Step 2: Convert to fraction form
    85,672.37/128,520.84 = 26,512.67/x
  3. Step 3: Cross multiply
    85,672.37x = 128,520.84 × 26,512.67
  4. Step 4: Simplify right side
    85,672.37x = 3,407,430,619.04
  5. Step 5: Solve for x
    x = 3,407,430,619.04/85,672.37
  6. Step 6: Final answer
    x = 39,772.81

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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.