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Finding the Fourth Proportional to 85,808.64, 128,761.29 and 67,036.05

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Solution

The fourth proportional to 85,808.64, 128,761.29 and 67,036.05 is: 100,591.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,808.64 : 128,761.29 = 67,036.05 : x
  2. Step 2: Convert to fraction form
    85,808.64/128,761.29 = 67,036.05/x
  3. Step 3: Cross multiply
    85,808.64x = 128,761.29 × 67,036.05
  4. Step 4: Simplify right side
    85,808.64x = 8,631,648,274.50
  5. Step 5: Solve for x
    x = 8,631,648,274.50/85,808.64
  6. Step 6: Final answer
    x = 100,591.83

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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.