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Finding the Fourth Proportional to 85,872.70, 128,809.05 and 80,040.70

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Solution

The fourth proportional to 85,872.70, 128,809.05 and 80,040.70 is: 120,061.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,872.70 : 128,809.05 = 80,040.70 : x
  2. Step 2: Convert to fraction form
    85,872.70/128,809.05 = 80,040.70/x
  3. Step 3: Cross multiply
    85,872.70x = 128,809.05 × 80,040.70
  4. Step 4: Simplify right side
    85,872.70x = 10,309,966,528.34
  5. Step 5: Solve for x
    x = 10,309,966,528.34/85,872.70
  6. Step 6: Final answer
    x = 120,061.05

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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.