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Finding the Fourth Proportional to 85,817.70, 128,872.35 and 63,656.10

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Solution

The fourth proportional to 85,817.70, 128,872.35 and 63,656.10 is: 95,592.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,817.70 : 128,872.35 = 63,656.10 : x
  2. Step 2: Convert to fraction form
    85,817.70/128,872.35 = 63,656.10/x
  3. Step 3: Cross multiply
    85,817.70x = 128,872.35 × 63,656.10
  4. Step 4: Simplify right side
    85,817.70x = 8,203,511,198.84
  5. Step 5: Solve for x
    x = 8,203,511,198.84/85,817.70
  6. Step 6: Final answer
    x = 95,592.30

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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.