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Finding the Fourth Proportional to 85,665.78, 128,424.75 and 41,231.34

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Solution

The fourth proportional to 85,665.78, 128,424.75 and 41,231.34 is: 61,811.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,665.78 : 128,424.75 = 41,231.34 : x
  2. Step 2: Convert to fraction form
    85,665.78/128,424.75 = 41,231.34/x
  3. Step 3: Cross multiply
    85,665.78x = 128,424.75 × 41,231.34
  4. Step 4: Simplify right side
    85,665.78x = 5,295,124,531.67
  5. Step 5: Solve for x
    x = 5,295,124,531.67/85,665.78
  6. Step 6: Final answer
    x = 61,811.43

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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.