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Finding the Fourth Proportional to 85,662.72, 128,505.96 and 26,490.60

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Solution

The fourth proportional to 85,662.72, 128,505.96 and 26,490.60 is: 39,739.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,662.72 : 128,505.96 = 26,490.60 : x
  2. Step 2: Convert to fraction form
    85,662.72/128,505.96 = 26,490.60/x
  3. Step 3: Cross multiply
    85,662.72x = 128,505.96 × 26,490.60
  4. Step 4: Simplify right side
    85,662.72x = 3,404,199,983.98
  5. Step 5: Solve for x
    x = 3,404,199,983.98/85,662.72
  6. Step 6: Final answer
    x = 39,739.57

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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.