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Finding the Fourth Proportional to 85,856.70, 128,785.05 and 80,024.70

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Solution

The fourth proportional to 85,856.70, 128,785.05 and 80,024.70 is: 120,037.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,856.70 : 128,785.05 = 80,024.70 : x
  2. Step 2: Convert to fraction form
    85,856.70/128,785.05 = 80,024.70/x
  3. Step 3: Cross multiply
    85,856.70x = 128,785.05 × 80,024.70
  4. Step 4: Simplify right side
    85,856.70x = 10,305,984,990.74
  5. Step 5: Solve for x
    x = 10,305,984,990.74/85,856.70
  6. Step 6: Final answer
    x = 120,037.05

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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.